washed with cold water the precipitate loses a large proportion, though not all, of the mercuric cyanide contained in it. Boiling water and cold potassium iodide solution extract the mercuric cyanide more readily. Experiments have been made in which the relative masses of the interacting substances were varied, these experiments prove that a true compound of the two cyanides is formed, and suffers decomposition to a greater or less extent, depending on the amount of water present. An examination of the curves plotted from these results leads to the inference that the double salt is a tetrazincic monomercuridecacyanide, Zn Hg(CN)10.—A lecture experiment to illustrate the phenomena of coal-dust explosions, by T. E. Thorpe. The author describes an apparatus by means of which the phenomena of a coal-dust explosion, resulting either from a local explosion of fire-damp or by the direct action of a blown-out shot, may be illustrated. The apparatus consists of a long narrow wooden box having an explosion chamber at one end; a thin layer of fine coal-dust or lycopodium powder is spread along the bottom of the box. On firing a mixture of coal-gas and air in the explosion chamber, the explosive wave sweeps along the box with increasing strength until it shoots out at the open end of the apparatus. By observations made with this apparatus the author finds that there is no evidence of a diminution of pressure along the sides of the space through which the flame rushes, and he is of opinion that there is no experimental proof of the validity of the "suction theory," which assumes that in consequence of this alleged diminution of pressure, occluded fire-damp is drawn out from the coal, and contributes to the violence of the explosion.-The production of the ketone, 1:2: 4 acetylorthoxylene from camphor by the action of sulphuric acid and zinc chloride, by H. E. Armstrong and F. S. Kipping. The authors have previously stated that they have separated a ketone of the composition C,H12O from the crude product of the action of sulphuric acid on camphor. On treatment with bromine the ketone yields a compound which readily decomposes, giving a monobromo-derivative, C,HBrO, melting at 63-64°. When oxidized with dilute nitric acid, the ketone yields two acids, separable by means of chloroform. One of these proves to be paraxylic acid, viz. 1:2:4 dimethylbenzoic acid, whilst the other is xylidinic or 1:2:4 methylisophthalic acid. The ketone is therefore 1: 2: 4 acetylorthoxylene, a compound which Claus has synthesized from acetic chloride and orthoxylene in presence of aluminium chloride.-Platinum tetrachloride, by W. Pullinger. The author has obtained platinum tetrachloride by heating hydrated hydrogen platinic, chloride in a current of dry hydrogen chloride at 163° for fifteen hours. When thus prepared, it is a very soluble, but not deliquescent, substance. -Note on a new acid from camphoric acid, by W. H. Perkin, Jun. When warmed with sulphuric acid, camphoric acid is converted into sulphocamphoric acid, with loss of water and carbon monoxide, C10H160, + H2SO1 = СC9H16 SO, CO + H,O. Kachler found that, when fused with potash, sulphocamphoric acid yields a crystalline substance, CH120, melting at 148, which is apparently not an acid. The author in repeating Kachler's experiments, but sulphonating at 100 instead of at 65°, obtained a well-characterized monobasic acid, C,HO, isomeric with this substance and melting at 108. It would appear from these results that the acid obtained by sulphonating camphoric acid at 100 is isomeric with ordinary sulphocamphoric acid.-The specific rotatory and cupric reducing power of invert sugar and of dextrose obtained from cane sugar by means of invertase, by J. O'Sullivan. The author describes experiments in which the hydrolysis of cane sugar was effected by means of invertase instead of by means of acid. The specific rotatory power of invert sugar obtained by means of invertase, which has no action on lævulose, is [a] = 24 5, and that of the dextrose prepared from such invert sugar is [a] = 57. The apparent specific rotatory power of lævulose calculated from these numbers is [a]; 106', or [a]=-938, a value agreeing with that generally accepted.-Ethyldimethylamidobenzene, by W. R. Hodgkinson and L. Limpach. This amine is prepared by heating paraxylidine hydrochloride with ethyl alcohol at 250-300. It is purified from diethyldimethylamidobenzene by crystallization of the sulphates. The sulphate of the latter substance is the more soluble. The formyl and acetyl derivatives of the amine are described. -Action of nitric acid on oxanilide and its analogues, by A. G. Perkin. author finds that oxanilide and its analogues are readily converted by nitration into the higher nitro-derivatives, thus differing from acetanilide and similar compounds, which yield dinitro-derivatives only with great difficulty. The Royal Meteorological Society, March 16.-Dr. C. Theodore Williams, the President, delivered an address on the value of meteorological instruments in the selection of health resorts. He drew attention to thermometers, maximum and minimum, as the foundation-stone on which medical climatology rests, and instanced effects of extreme cold or of heat on the human organism. The direct rays of the sun are of the greatest importance, and in health resorts should be utilized to the full-in fact, only climates where during the winter months even a delicate person can lie or sit for several hours a day basking in the sunshine are to be recommended for most complaints, and the various forms of sunshine-recorders are used to aid the medical adviser in the choice of such health stations. After referring to the value of rain gauges, hygrometers, and barometers, Dr. Williams stated that many health resorts owe their reputation almost solely to their shelter from cold winds; for instance, the advantage in climate which Hyères and Mentone enjoy over Marseilles is chiefly due to their being more sheltered from the Mistral, or north-west wind, 'the scourge of the lower valley of the Rhone from Valence to Avignon. He went on to describe the climate of the Riviera, illustrating it by lantern slides from recent photographs, including views of Hyères, Costabelle, Cannes, Nice, Mentone, San Remo, &c., and he showed the three prin cipal causes of the warm winter of this region to be (1) the southern latitude, (2) the protection from cold winds by mountain ranges, and (3) the equalizing and warming influence of the Mediterranean Sea, which, being practically tideless, is always equally potent, not varying with hour and season. Dr. Williams mentioned the weak points of the south of France climate, with its blustering Mistral, its occasional cold Bise, its moist Scirocco wind; but summed up the Riviera winter climate as being, as a whole, clear, bright, and dry, with fog and mist practically unknown, with a winter temperature from 8° to 10° higher than England though subject to considerable nocturnal radiation, with about half the number of rainy days, and four or five times the number of bright ones, which we can boast of, with cold winds and cold weather, without which it would lose its healthgiving effect.-After the delivery of this address the meeting was adjourned in order to allow the Fellows and their friends an opportunity to inspect the Exhibition of Instruments relating to climatology, which had been arranged in the rooms of the Institution of Civil Engineers, 25 Great George Street. The Meteorological Office showed a set of instruments necessary for the equipment of a climatological station, viz. Stevenson thermometer screen, fitted with dry bulb, wet bulb, maximum and minimum thermometers, and alsɔ a rain gauge. Thermometers were also shown for ascertaining the temperature on the ground, under the ground, and at a distance, as well as for recording temperature continuously. Various forms of sunshine-recorders were exhibited, as well as a number of actinometers and solar radiation instruments for ascertaining the heating effect of the solar rays. The Exhibition included a large and interesting collection of hygrometers, also several rain-gauges and other instruments. Among the curiosities was a piece of plate glass, which was "starred" during a thunderstorm on August 21, 1879; this was not broken, but it has a number of wavy hair-like lines. The Exhibition contained a large number of beautiful photographs of clouds, lightning, and snow scenes, as well as of the damage done by the destructive tornado at Lawrence, Mass., U.S.A. The Exhibition remained open until Tuesday, the 22nd ult. Anthropological Institute, March 22.-Francis Galton, F.R.S., Vice-President, in the chair.-Mr. Theodore Bent read a paper on the finds at the Great Zimbabwe ruins. The outer wall of the semicircular temple on the hill is decorated by a number of birds perched on long soapstone pedestals, all of which appear to be intended to represent the same bird, probably a vulture. Two of the birds, similar in character and slightly varying from the others, are represented as perched on zones or cesti, and there seems to be a similar class of symbolism connecting them all. Mr. Bent is of opinion that these birds represent the Assyrian Astarte or Venus-the female element in creation. In the centre of the temple stood an altar, into the stones of which were inserted a large number of soapstone objects, which afforded ample evidence of the existence of phallic worship in this place. Within the sacred inclosure are two solid round towers, the largest of which is 34 feet in height and has a girth of 53 feet. Before them is a raised platform, presumably for sacrifice, and the wall behind them is decorated with large standing monoliths. Some of the fragments of pottery found are very good, and give evidence of a highly developed artistic skill. Close underneath the temple stood a gold-smelting furnace, made of very hard cement of powdered granite, with a chimney of the same material, and the quantity of rejected quartz found hard by proved that these ruins had formed the fortress for the protection of a gold-producing people. The ruins and the things in them are not in any way connected with any known African race; the objects of art and of special cult are foreign altogether to the country, and neither the date of construction nor the race of the builders can now be determined with accuracy; but the evidence in favour of this race being one of the many tribes of Arabia is very strong, and all the facts point to a remote antiquity. PARIS. Academy of Sciences, March 28.-M. d'Abbadie in the chair.-Note on a theorem on the calculation of probabilities, by M. J. Bertrand.-On the periodic variations of latitude, according to a letter from M. Helmert to the members of the Permanent Commission of the International Geodetic Association, by M. Faye. (See Our Astronomical Column.)-On the approximate theoretical calculation of the delivery from an orifice in a thin wall, by M. J. Boussinesq.-On the population of the five continents of the earth, by M. Emile Levasseur. comparison of M. Levasseur's estimations with those given by others shows that the differences are greater for Africa, Asia, Oceania, and America, than for Europe. This is what would be expected. M. Levasseur's numbers are as follows: A -Note on a theory on the production of various vegetable galls, by M. A. Laboulbène.-Mechanical laws of atmospheric circulation; surfaces of equal density; squalls; secondary and general circulations, by M. Le Goarant de Tromelin.-Observations of Swift's comet (Rochester, March 6, 1892) and of the minor planet discovered by Wolf on March 18, made with the East Tower equatorial of Paris Observatory, by Mdlle. D. Klumpke. Observations for position were made on March 17, 21, 23, and 24. Observations of Swift's comet made at Toulouse Observatory, by M. B. Baillaud. Observations for position were made on March 16, 18, 19, 21, and 25.-Observations of Wolf's periodic comet made with the great telescope of Toulouse Observatory, by MM. E. Cosserat and F. Rossard. Dates of observations for position: November 28, December 1, 4, 21, 22, 26, and 31.-On plane réseaux having equal invariants, by M. G. Koenigs.-On congruences of which the mean surface is a plane, by M. C. Guichard.-On the existence of integrals in differential systems, by M. Riquier.—An electro-ballistic chronograph, by M. W. Schmidt.-On the radiations of incandescent bodies and the optical measure of high temperatures, by M. J. Violle. By estimating the intensities of the lines at C and D in the radiations of a piece of platinum, the author has determined the temperature of the metal. His results agree very well with those obtained by M. Le Chatelier up to 1500°.-On the temperature of the sun, by M. H. Le Chatelier. (See Our Astronomical Column.)-Application of the theory of lines of force to the demonstration of an electrostratic theorem, by M. L. de la Rive.-On electro-capillary phenomena, by M. A. Berget. On a safety-lamp for use with coal gas, by M. F. Parmentier. The author records some experiments on the action of platinum wires and crucibles in cooling flames below the temperature necessary for the combustion of the gases.Action of potassium fluoride on anhydrous chlorides; preparation of anhydrous fluorides of nickel and potassium, and of cobalt and potassium, by M. C. Poulenc. The compounds prepared have the composition NiKF, and CoKF3. Full descriptions are given of the mode of preparation and the properties of the new substances.-On the fixation of iodine by starch, by M. G. Rouvier.-On the estimation of fluorine, by M. Ad. Carnot.-On the aldehydes and acetone bromides which result from the action of bromine on alcohols of the fatty group, by M. A. Étard.-On propylamines and some of their derivatives, by M. F. Chancel.-On some reactions of isomeric amido- benzoic acids, by M. Oechsner de Coninck.-Study of the velocity of decomposition of diazocompounds, by MM. J. Hausser and P. Th. Muller.-On two fluorhydrines of glycerine, by M. Maurice Meslans. (See Notes.) -On the mode of union of rings of the abdomen (zigzag articulation) of Hymenoptera, by M. G. Carlet.-On the embryonic development of the Galatheida of the genus Diptychus, by M. E. L. Bouvier.-On the histology of the pituitary gland, by M. G. Saint-Remy. -On the blue colouring matter in the blood of Crustacea, by M. F. Heim.-On a new marine Rhizopod (Pontomyxa flava, g. et sp. n.), by M. E. Topsent.-The streptonary nervous system of Heteropods, by M. Paul Pelseneer. -Observations on l'anthracnose maculée, by M. Louis Mangin. -On the artificial culture of Diatomaceæ, by M. P. Miquel.On the crystalline rocks of Chablais, by M. Michel-Lévy.-The Saint-Béat marble, its age and stratigraphical relations, by M. Caralp.-On some minimum perceptible quantities of certain odours, by M. Jacques Passy.-Difference in the functions exercised on the bladder by the afferent nerves of the hypogastric plexus, by M. Lannegrace.-On the Martinique cyclone of August 18, 1891, by M. G. Landes.—Magnetic disturbances and seismic phenomena, by M. Émile Rivière. BOOKS and PAMPHLETS RECEIVED. Books.-Index of Meteorological Observations in the United States (Washington).-Essex Institute Historical Collections, vol. xxvii. (Salem, Mass.) A New Course of Experimental Chemistry: J. Castell-Evans (Murby).-Souvenir of Shakespeare's King Henry the Eighth (Black and White) Deutsches Meteorologisches Jahrbuch für 1890 (Hamburg).Island Life, 2nd edition: A R. Wallace (Macmillan).-A Naturalist in the Transvaal: W. L. Distant (Porter).-The Clyde Sea Area: Dr. H. R. Mill (Williams and Norgate).-Live Stock: Prof. J. Wrightson (Cassell).-The Great Earthquake in Japan, 1891: J. Milne and W. K. Burton (Stanford). PAMPHLETS.-Azimut Assoluto del Segnale Trigonometrico di Monte Vesco sull'orizzonte di Torino: F. Porro (Torino).-Ergebnisse der Meteorologischen Beobachtungen im Systeme der Deutsche Seewarte für das Lustrum 1886-90 (Hamburg). Ornithology of the Sandwich Isles.-Prof. Alfred 532 532 532 Letters to the Editor: M. Poincaré and Maxwell.-Prof. Geo. Fras. Fitz- Prof. Burnside's Paper on the Partition of Energy, Double Orange.-Gerald B. Francis Metals at High Temperatures. (Iliustrated.) By Prof. Our Astronomical Column: The Relative Motion of 61 Cygni The Temperature of the Sun Comet Swift, March 6 N. P.D.'s observed with Greenwich and Washington Transit Circles . THURSDAY, APRIL 14, 1892. A REMARKABLE BOOK ON THE HABITS OF ANIMALS. The Naturalist in La Plata. By W. H. Hudson, C.Z.M.S. With Illustrations. (London: Chapman and Hall, Ltd., 1892.) THIS HIS volume deserved a more distinctive title, since it differs widely from the several works of other naturalists with which it may be classed judging from the title-page alone. It is, in fact, so far as the present writer knows, altogether unique among books on natural history. It is to be hoped that its success will be proportional to its merits, and that it will form the first of a series of volumes, by means of which residents in the various extra-European countries will make known to us the habits of the animals which surround them. What renders this work of such extreme value and interest is, that it is not written by a traveller or a mere temporary resident, but by one born in the country, to whom its various tribes of beasts, birds, and insects have been familiar from childhood; who is imbued with love and admiration for every form of life; and who for twenty years has observed carefully and recorded accurately everything of interest in the life-histories of the various species with which he has become acquainted. When we add to this the fact that the writer of this volume is well acquainted with the literature, both old and new, bearing upon his subject; that he groups his facts and observations so as to throw light on obscure problems, and often adduces evidence calculated to decide them; and, in addition to all this, that the book is written in an earnest spirit and in a clear and delightful style, it becomes evident that not all who attempt to follow in his steps can hope to equal their forerunner. As every chapter of the book contains new and interesting matter, it is difficult to convey an adequate idea of it by partial extracts or by an enumeration of its chief topics; but the attempt must be made. The first chapter gives us a general sketch of the "Desert Pampas" and its forms of animal life. The viscacha, the coypu, and the tucu-tucu-three strange rodents-are brought vividly before us by a description of some of their more prominent habits; the edentate armadilloes appear in a new light, since one of them, the hairy armadillo, is shown to be a dominant species holding its own against enemies of higher type, so omnivorous that it can live on almost everything from grass to flesh, the latter either found dead and in all stages of decay or captured by means of its own strategy. It is so agile that it catches mice, so strong and well armed that it kills poisonous snakes, and having killed them cuts them in pieces and swallows as much as it needs. Mr. Hudson adds: : "It is much hunted for its flesh, dogs being trained for the purpose; yet it actually becomes more abundant as population increases in any district; and, if versatility in habits or adaptiveness can be taken as a measure of intelligence, this poor armadillo, a survival of the past, so old on the earth as to have existed contemporaneously with the giant glyptodon, is the superior of the largebrained cats and canines." Equally extraordinary are the still lower opossums, one of which is semi-aquatic and apparently adapted to its surroundings, while the other species (Didelphys azaræ) is in every way adapted to an arboreal life, yet it is everywhere found in this level treeless district, which leads to one of our author's suggestive remarks :: "For how many thousands of years has this marsupia been a dweller on the plain, all its best faculties unexercised, its beautiful grasping hands pressed to the ground, and its prehensile tail dragged like an idle rope behind it! Yet, if one is brought to a tree, it will take to it as readily as a duck to water, or an armadillo to earth, climbing up the trunk and about the branches with a monkey-like agility. How reluctant Nature seems in some cases to undo her own work! How long she will allow a specialized organ, with the correlated instinct, to rest without use, yet ready to flash forth on the instant, bright and keen-edged, as in the ancient days of strife, ages past, before peace came to dwell on earth!" But we must pass on from this mere preliminary chapter to more solid matter, only noting that we have a vivid sketch of the great rhea or American ostrich, of the flamingo, the swans, and the noble crested screamer, all of which are being exterminated by increasing population and improved weapons; and this leads to a noble protest against this extermination, of which we can only quote the concluding words :— "Only when this sporting rage has spent itself, when there are no longer any animals of the larger kinds remaining, the loss we are now inflicting on this our heritage, in which we have a life-interest only, will be rightly appreciated. It is hardly to be supposed or hoped that posterity will feel satisfied with our monographs of extinct species, and the few crumbling bones and faded feathers which may possibly survive half-a-dozen centuries in some happily-placed Museum. On the contrary, such dreary mementoes will only serve to remind them of their loss; and if they remember us at all, it will only be to hate our memory, and our age-this enlightened, scientific, humanitarian age, which should have for its motto, 'Let us slay all noble and beautiful things, for to-morrow we die.'" A chapter devoted to the puma is full of new and inColumbia to the Straits of Magellan, but throughout this teresting matter. This animal ranges from British vast region there seems to be no authentic record of its ever attacking men except in self-defence. This has led the bravest of the feline race, since it constantly attacks to its being thought to be cowardly, whereas it is one of and conquers the jaguar whenever the two inhabit the same district, while in North California it is the enemy of the grizzly bear, and is again always the victor. In the Pampas, where it is common, the fact that it never attacks man, in however helpless a position he may be, is so well known, that the Gaucho confidently sleeps on the ground, although he knows that pumas are close by; while it is said that a child may sleep on the plain unprotected in equal security. Many curious anecdotes are given in illustration of this remarkable trait of so powerful and, as regards all other large Mammalia, bloodthirsty a creature. And the curious thing is that it seems to be no dread or dislike of man that leads to the peculiarity, but rather some strange feeling of affection, or sense of pleasure in man's vicinity, shown in many curious ways, which has led the Pampas-dwelling Gauchos to call it "the friend of man." In the next chapter, entitled "A Wave of Life," we have a far broader subject touched upon and iliustrated by a mass of curious observations. The interdependence and complex relations of species, so admirably portrayed by Darwin, are here brought vividly before us. We are told how, during a fine moist summer, when grass and flowers were abundant, mice increased to an abnormal extent, so that everywhere in the fields it was difficult to avoid treading on them, while dozens could be shaken out of every hollow thistle-stalk lying on the ground. The most incongruous animals swarmed to the feast which they provided. Dogs lived almost entirely on them, as did the domestic fowls, assuming the habits of rapacious birds. The cats all left the houses to live in the fields. Tyrant-birds and cuckoos seemed to prey on nothing else. Foxes, weasels, and opossums fared sumptuously, and even the common armadillo turned mouser with great success. Storks and short-eared owls gathered to the feast, so that fifty of the latter birds could often be seen at once, and they got fat and bred in the middle of winter, quite out of their proper season, in consequence. The following winter was a time of drought, the grass and herbage had all been consumed or was burnt up, and the mice, having no shelter, and being obliged to search for food, soon fell a prey to their numerous enemies, and were almost wholly exterminated. Their vast increase, by bringing together innumerable enemies, was the cause of their succeeding decrease. As Mr. Hudson well remarks: "Here, scene after scene in one of Nature's silent, passionless tragedies opens before us, countless myriads of highly-organized beings rising into existence only to perish almost immediately, scarcely a hard-pressed remnant remaining after the great reaction to continue the species." We cannot stop to notice a tithe of the curiosities of natural history with which this volume abounds, such as the poisonous toad which kills horses, and the wrestler frog, which gives a sudden pinch to an enemy with its muscular fore-legs, and then escapes; the huge venomous man-chasing spider, a species of Lycosa, which actually pursues men on foot and on horseback; the strange dread which gnats, mosquitoes, and sand-flies have of dragon-flies, so that a single individual of the latter insect will cause clouds of the tormentors instantly to disappear; the interesting discussion on parasite problems, and the wonderful storms of dragon-flies which precede windstorms from the interior; the new and interesting cases of mimicry and of warning colours; and the delightful chapter on the crested screamer, the author's prime favourite among all the denizens of the Pampas, which, though possessing a body as large as that of a swan, yet soars up into the air like a lark, and in flocks of thousands, when so high as to appear only specks in the blue sky, pours forth its song in silvery sounds delightful to listen to. These and many other matters of interest must be studied in the book itself, since we must devote the remainder of our limited space to some valuable observations and discussions on certain instincts, by which new light is thrown on several disputed questions. The chapter on "Fear in Birds" is especially interesting, since the result of the author's observations is opposed to the view held by Darwin and Herbert Spencer as to their instinctive fear of man or birds of prey antecedent to experience or parental teaching. The one thing that is instinctive is the alarm caused by the warning note of the parent. This produces an effect even before the chick is hatched, for, in three different species belonging to widely separated orders, Mr. Hudson has watched the nest while a young bird was chipping its way out of the egg and uttering its feeble peep, when, on hearing the warning cry of the mother-bird, both sounds instantly cease, and the chick remains quiescent in the shell for a long time, or till the parent's changed note shows that the danger is over. Young nestling birds take their food as readily from man as from their parents, till they hear the warning cry, when they immediately close their mouths, and crouch down frightened in the nest. Parasitical birds which do not recognize the warning cries of their foster-parents show no fear. The young parasitical cow-bird takes food from man, and exhibits no fear although the foster-parents are hovering close by screaming their alarm notes. So, a young wild dove, reared from the egg by domestic pigeons which, never being fed, were half wild in their habits, never acquired the wildness of its foster-parents, but became perfectly tame and showed no more fear of a man than of a horse. He had none of his own kind to learn from, and did not understand either the voices or the actions of the dovecot pigeons. Mr. Hudson has also reared plovers, tinamous, coots, and many other wild birds from eggs hatched by fowls, and found them all quite incapable of distinguishing friend from foe, while some, such as the rhea and the crested screamer, are much tamer when young than domestic chickens and ducklings. But Mr. Hudson concludes that birds learn to distinguish their enemies, first from parental warnings and later by personal experience, and he considers that this view is confirmed by the different behaviour of birds in the presence of various species of the hawk tribe, the amount of alarm shown being exactly proportionate to the degree of danger. Some hawks never attack birds, others only occasionally. The chimango kite is chiefly a carrionfeeder, and its presence excites no alarm among small birds. One of the harriers is so like the chimango in some states of plumage that the latter is sometimes mistaken for it, and a certain amount of fear is exhibited, which, however, soon passes away on discovering the real nature of the intruder. Buzzards are still more feared than harriers, as they are more destructive to birds, and they cause a somewhat greater amount of alarm. most dangerous of all is the peregrine falcon, and, however high in the air this may be, the feathered world is thrown into the greatest commotion, all birds, from the smallest up to species as large as duck, ibis, and curlew, rushing about as if distracted. Even when the falcon has disappeared, the wave of terror excited by it subsides but slowly, and the birds continue for a considerable time to be wild and excited. Now, this nicely-measured alarm, proportioned to the danger to be apprehended from the different species, can hardly be due to inherited instinct, even if this could explain the general dread of raptorial birds; and, taken in connection with the numerous other facts in the habits of young birds, leads to the conclusion that fear of enemies is wholly the result of education and experience. Perhaps the most interesting chapter in the whole volume, the fullest in new matter, and the most important in its bearing on a much-disputed theory, is that on "Music and Dancing in Nature." The result of Mr. Hudson's long-continued observations is that almost all mammals and birds have the habit of indulging occasionally in more or less regular performances, with or without sound, or composed of sound only, some being only discordant cries and choruses or uncouth irregular motions, while the more aërial, graceful, and melodious kinds exhibit more complex and more beautiful forms. It is among birds that this habit is most fully developed and presents itself in the most graceful or fantastic performances. Great numbers of birds of very different forms and habits-hawks, vultures, ibises, spoonbills, and gulls circle about in the air, singly or in flocks, and apparently for the mere delight in aërial motion. Sometimes they rise to vast altitudes, and float about in the air in one spot for an hour or longer at a time, hundreds of birds gliding in and out among each other with perfect precision as in a set dance. Ibises and ducks have special performances of their own, but perhaps the most curious are those of some species of rails. The ypecaha rails have meeting-places on smooth level ground near the water and well surrounded by dense beds of rushes. One bird sounds a note of invitation; others from all sides come hurriedly to the place, where they begin a strange screaming concert, rushing about all the time. The cries they utter somewhat resemble human screams of terror, frenzy, or despair, mingled with half-smothered cries of pain and moans of anguish. This exhibition lasts a few minutes, after which the assembly peacefully breaks up. The singular wattled, wing-spurred, and long-toed jacanas have a different kind of meeting. They usually go singly or in pairs; but occasionally, in response to a call by one of them, all who are within hearing leave off feeding and fly to one spot, where they walk about with their beautiful wings erect or half open, or waved up and down with a slow and measured motion. With these two species both sexes join in the display; but that of the spur-winged lapwing is altogether peculiar, inasmuch as it takes place with three individuals only. These birds live in pairs, and at intervals during the day or on moonlight nights, one bird will leave his mate and fly to another pair a short distance off. These will receive the visitor with signs of pleasure. First going to meet him, they place themselves behind him, and all three march rapidly, uttering special notes. Then they stop; the leader stands erect with elevated wings uttering loud notes, while the other two, with puffed-out plumage, standing side by side, stoop forward till the tips of their beaks touch the ground, and with a low murmuring sound remain for some moments in this strange posture. Then the visitor goes back to his own ground and mate, and later on they receive a visitor, whom they treat in the same ceremonious fashion. They are said to be so fond of this form of visiting that they indulge in it all the year round, and the illustration representing it is a most curious and fantastic picture of bird life. A considerable number of Passerine birds also have curious displays, which are here described, as well as songs of a most remarkable character. Some sing alone, others in concert; in most instances the voice is at its best during the mating period, but in one of the smaller finches the song is at that time feeble, while at a later period it becomes far more powerful and melodious. There is one species, the white-banded mocking-bird, which is considered to exceed all other songsters in the copiousness, variety, and brilliant character of its music. By the half-hour it will first imitate with great accuracy the songs of many other species-a strange and beautiful performance; but this is merely the prelude to its own song, which is "uttered with a power, abandon, and joyousness resembling, but greatly exceeding, that of the skylark singing 'at Heaven's gate'; the note issuing in a continuous torrent; the voice so brilliant and infinitely varied that, if rivalry and emulation have as large a | place in feathered breasts as some imagine, all that hear this surpassing melody might well languish ever after in silent despair." Mr. Hudson's conclusion as to the meaning of the various actions and vocal performances that he describes, and of which only a few cases have been here referred to, is as follows: "I wish now to put this question: What relation that we can see or imagine to the passion of love and the business of courtship have these dancing and vocal performances in nine cases out of ten? In such cases, for instance, as that of the scissors-tail tyrant-bird, and its pyrotechnic evening displays, when a number of couples leave their nests, containing eggs and young, to join in a wild aërial dance; the mad exhibitions of ypecahas and ibises, and the jacanas' beautiful display of grouped wings; the triplet dances of the spur-winged lapwing, to perform which two birds already mated are compelled to call in a third bird to complete the set; the harmonious duets of the oven-birds, and the duets and choruses of nearly all the wood-hewers, and the wing slapping aërial displays of the whistling widgeons; will it be seriously contended that the female of this species makes choice of the male able to administer the most vigorous and artistic slaps? . . . There are many species in which the male, singly or with others, practises antics or sings during the love-season before the female; and when all such cases, or rather those which are most striking and bizarre, are brought together, and when it is gratuitously asserted that the females do choose the males that show off in the best manner or that sing best, a case for sexual selection seems to be made out. How unfair the argument is, based on these carefully selected cases gathered from all regions of the globe, and often not properly reported, is seen when we turn from the book to Nature, and closely consider the habits and actions of all the species inhabiting any one district. We see then that such cases as those described and made so much of in the Descent of Man,' and cases like those mentioned in this chapter, are not essentially different in character, but are manifestations of one instinct, which appears to be almost universal among the higher animals. The explanation I have to offer lies very much on the surface. We see that the inferior animals, when the conditions of life are favourable, are subject to periodical fits of gladness, affecting them powerfully, and standing out in vivid contrast to their ordinary temper. And we know what this feeling is-this periodic intense elation which even civilized man occasionally experiences when in perfect health, more especially when young. There are moments when he is mad with joy, when he cannot keep still, when his impulse is to sing and shout aloud and laugh at nothing, to run and leap and exert himself in some extravagant way." |