up the expedition under the auspices of the Carnegie Institution to extend his researches on the desert flora, and on the journey down to Mexico the author tells us of their visit to the famous "Desert Botanical Garden" near Tucson, Arizona, of which Dr. MacDougal was one of the originators, and from which point the expedition outfitted. To those who have explored in the semi-arid regions of the western states the account given by Mr. Hornaday of their cross-country trip, recalls many familiar scenes. The cold mornings, the blistering hot days and the delightfully cool evenings are all features of a trip into the desert regions of the west. All the scenes along the trail are brought before the reader by pictures from pen and camera. The colored photographs are especially striking. Botanists will find an interesting account of the desert flora of southern Arizona and northern Mexico and the zoologist will find a description of the few animals which can manage to exist in this forlorn region. There is ever an attraction in the desert; even the barrenness of things and the apparent absence of all life make what little life there is all the more interesting. On the arrival of the party near the Pinacate region a long camp was made and short exploring trips were conducted from the main camp. This was made necessary from the fact that the character of the country forbade further progress with the wagons. At this place also occurred the only "row" of the Old campers know how painful it is to have a "row" on It is painful for those immediately concerned and trip. in camp. Their stay at Pinacate was of for those who have to witness it. some length and full of success. and saw many interesting plants and photographed many new plants and craters which abounded there. The most abundant large mammal was the mountain sheep, Ovis canadensis. author gives, in chapter XXIV, a discussion of the geographical distribution of the mountain sheep and also the synonymy of the species and subspecies of this interesting group of ungulates. The The last two chapters tell of the flight from Pinacate and the return to civilization. "The reaction from the steady and severe rush of the trip left us limp and spiritless, and it was four full days ere one member of the party began to feel quite like himself again." Thus ends the account of this unique exploring trip into the unknown regions of the southwest. ROY L. MOODIE. A Monthly Journal, established in 1867, Devoted to the Advancement of the Biological Sciences with Special Reference to the Factors of Organic Evolution and Heredity CONTENTS OF THE AUGUST NUMBER The Mid-summer Bird Life of Illinois: A Statistical Study. Professor S. A. FORBES. The Life Cycle of Paramecium when subjected to a Varied Environment. DR. LORANDE LOSS WOOD RUFF. Placobdella Pediculata n. sp. ERNEST E. HEMINWAY. Marine Laboratories and our Atlantic Coast. DR. ALFRED G. MAYER. Biometry as a Method in Taxonomy. CHARLES LINCOLN EDWARDS, Professor Shorter Articles and Correspondence: The Genus Ptilocrinus, AUSTIN HOBART CLARK. A New Rhinoceros from the Lower Miocene of Nebraska, HAROLD JAMES COOK, Notes and Literature: Plant Cytology-Some Recent Research on the Cilia-forming Organ of Plant Cells, DR. BRADLEY M. DAVIS. Ornithology-Riddle on the Genesis of Fault-bars and the Cause of Alternation of Light and Dark Bars in Feathers, J. A. A. Herpetology-Ruthven's Variations and Genetic Relationships of the Garter-snakes, J. A. A. Lepidoptera -Hybrid Lepidoptera, Professor T.D. A. COCKERELL CONTENTS OF THE OCTOBER NUMBER The Manifestations of the Principles of Chemical Mechanics in the Living Plant, DR. F. F. BLACK MAN The Desiccation of Rotifers. D. D. WHITNEY. On the Habits and the Pose of the Sauropodous Dinasaurs, especially of Diplodocus, DR. OLIVER P. HAY. Shorter Articles and Correspondence: Juvenile Substitutes for Smoking Tobacco. Professor WILLIAM ALBERT SETCHELL. Notes and Literature: Heredity-Recent Studies in Human Heredity, DR. F. A. WOODS. Ornithology— Riddle on the Cause of the Production of Down and Down-like Structures in the Plumages of Birds, J. A. A. Vertebrate Paleontology-New Fossil Mammals from Egypt, T. D. A. C. CONTENTS OF THE DECEMBER NUMBER Some Physiological Aspects of Radium Rays. Professor C. STUART GAGER. On the Origin of Structures in Plants. W. A. CANNON, Origin and Formation of the Froth in Spittle Insects. BRAXTON H. GUILBEAU. Shorter Articles and Correspondence: Peculiar Abnor mal Teeth in a Jack Rabbit. WILLIAM A. HILTON. Notes and Literature: Ichthyology-Ichthyological Notes, President DAVID STARR JORDAN. The Inheritance of Sex in Higher Plants-Digest of Professor C. Correns's Memoir : Professor H. E. JORDAN, Title Page and Index to Volume XLIL CONTENTS OF SEPTEMBER NUMBER Some results of the Florissant Expedition of 1908. Professor T. D. A. COCKERELL. Embryology of Myosurus Minimus. DR. LEROY D. SWINGLE. Another Aspect of the Species Question. DR. J. A. ALLEN. The Origin of the Lateral Eyes of Vertebrates Professor G. H. PARKER, Notes and Literature: Heredity-Spurious Allelomorphism, Results of Some Recent Investiga tions, W. J. SPILLMAN. Human AnatomyPryor on Sexual and Family Variation in Centers of Ossification, C. R. B. Plant Cytology-Cytological Studies on Saprolegnia and Vaucheria. DR. BRADLEY M. DAVIS. Holothurians-Holothurioidea, Professor CHARLES L. EDWARDS. Enteropneusta-Recent Literature on the Enteropneusta, Professor W. E. RITTER. Vertebrate Paleontology-Case on Pelycosauria of North America; Barnum Brown on the Conrad Fissure and on the Ankylosauridæ, Professor S. W. WILLISTON. Parasitology-The Evolution of Parasitism; Trypanosomes, H. B. W. CONTENTS OF THE NOVEMBER NUMBER Further Studies on the Activities of Araneads. Professor THOS. H. MONTGOMERY, Jr. Notes on the Daily Life and Food of Cambarus Bartonius Bartoni. FLOYD E. CHIDESTER. Some Points in the Ecology of Recent Crinoids. AUSTIN HOBART CLARK. Shorter Articles and Correspondence: Evolution without Isolation, O. F. COOK. A Note on the Silverside, JOHN TREADWELL NICHOLS, Notes and Literature: Botany-The Origin of a Land Flora, Professor DOUGLASS HOUGHTON CAMPBELL. Plant Cytology-Apogamy in the Ferns, Dr. BRADLEY M. DAVIS. Experimental Evolution-Regeneration in Lumbriculus, SERGIUS MORGULIS. The Budgett Memorial Volume-John Samuel Budgett, President DAVID STARR JORDAN. Animal Behavior-Mind in Animals, Professor H. S. JENNINGS. CONTENTS OF THE JANUARY NUMBER Juvenile Kelps and the Recapitulation Theory. Professor ROBERT F. GRIGGS, The Larva and Spat of the Canadian Oyster, Dr. J. STAFFORD. Shorter Articles and Correspondence: Some Notes on the Traditions of the Natives of Northeastern Siberia about the Mammoth, WALDEMAR JOCHELSON. Age of Trotting Horse Sires, F. R. MARSHALL The Occurrence of Batrachoceps attenuatus and Autodar lugubris in Southern California, WILLIAM A. HILTON. Notes and Literature: Erperimental Evolution-The Effect of the Environment upon Animals, Dr. FRANK E LUTZ. Experimental Zoology-The Influence of the Size of the Egg and Temperature on the Growth of the Frog, SERGIUS MORGULIS. Parasitology-Cestodes of Birds, Professor HENRY B WARD. Single Number 35 Cents Yearly Subscription, $4.00 The NATURALIST will be sent to new subscribers for four months for One Dollar THE SCIENCE PRESS Garrison, N. Y. Sub-Station 84: NEW YORK Lancaster, Pa. Practical Exercises in Microscopical Methods By MICHAEL F. GUYER THE 250 pages, 8vo, cloth; net $1.75, postpaid $1.88 'HE title of this book will explain its scope. It is intended as a laboratory manual for textbook use. Its aim is to introduce the student to the technique of microscopic anatomy and embryology, emphasizing details of procedure rather than descriptions of reagents or apparatus. Sufficient account of the theoretical side of microscopy is given to enable the student to get satisfactory results from his microscope. The directions are simple, explicit. and complete.-American Journal of Clinical Medicine. The medical student will find it very useful as a guide to microscopic work. -Journal of the American Medical Association. This is one of the cleanest works on microscopical technique we have ever seen, and is especially suitable for the beginner. It is full of points, tricks of technique not mentioned in other works, and is one that every student and physician should have.-Medical Century. This valuable book is strong through its rigid exclusion of the trite and the conflicting. It is lucid and helpful, because a man long practiced in practical work has given what he believes the most expeditious and reliable method of obtaining a definite and comprehensive result.-Medical Notes and Queries. A concise, eminently practical, and well-classified treatment.-Science. The expositions of the methods. recommended are admirably clear.Nature. One of the best and most practical works upon microscopic technique with which we are acquainted.American Naturalist. As a textbook it can hardly be improved. The research worker will find in this book just the information he frequently needs in preparing material with which he is not familiar. -School Review. It does present in very clear form a jndicions selection of methods, including an excellent untechnical account of the microscope and its optical principles, adequate for the undergraduate course in histology.-Journal of Comparative Neurology and Psychology. 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