The American Journal of Science and ArtsS. Converse, 1860 |
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Página v
... Aurora Borealis and its theory , 268. - Human Remains in the Drift : Curare in the treat- ment of Tetanus , 269. - The new alloys of Platinum : Rifled Cannon , 270. - Acclimation : Photo - Chemical Re- searches Persistent Activity of ...
... Aurora Borealis and its theory , 268. - Human Remains in the Drift : Curare in the treat- ment of Tetanus , 269. - The new alloys of Platinum : Rifled Cannon , 270. - Acclimation : Photo - Chemical Re- searches Persistent Activity of ...
Página 21
... Aurora Island ( another of the group ) uncolored , on account of the doubtful evidence regarding it , which however is in favor of its being in the same condition as Elizabeth's Island . From a list of species communicated by Mr. Dana ...
... Aurora Island ( another of the group ) uncolored , on account of the doubtful evidence regarding it , which however is in favor of its being in the same condition as Elizabeth's Island . From a list of species communicated by Mr. Dana ...
Página 92
... Aurora upon the wires of the electric telegraph . We hope in our next Number to be able to communicate additional intelligence respecting this Aurora . 1. Observations made at Boston , Mass . , and its vicinity by GEORGE B. PRESCOTT ...
... Aurora upon the wires of the electric telegraph . We hope in our next Number to be able to communicate additional intelligence respecting this Aurora . 1. Observations made at Boston , Mass . , and its vicinity by GEORGE B. PRESCOTT ...
Página 93
... Aurora Borealis , as will be seen from the following . Thursday , February 19 , 1852. Towards evening a blue line . appeared upon the paper , which gradually grew darker and larger , until a flame of fire followed the pen , and burned ...
... Aurora Borealis , as will be seen from the following . Thursday , February 19 , 1852. Towards evening a blue line . appeared upon the paper , which gradually grew darker and larger , until a flame of fire followed the pen , and burned ...
Página 94
... aurora - each wave occupying from fifteen seconds to half a minute . When the poles of the Aurora were in unison with the poles of the battery upon the line , the effect was to increase the current ; but when they were opposed , to ...
... aurora - each wave occupying from fifteen seconds to half a minute . When the poles of the Aurora were in unison with the poles of the battery upon the line , the effect was to increase the current ; but when they were opposed , to ...
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Términos y frases comunes
acid American ammonia animals antimony appears arsenic atomic weight aurora Australia beds bismuth carbon carbonic acid Carboniferous character chemical chlorid coast color containing Cretaceous crystals Dép described determine Dicotyledons direction dolomite equivalent existing fact flame flora fluorine formation formula fossil genera genus geographical geological gives gypsum horizon inches iridium iron Journal jurassic known lake less light lignite limestone magnetic mass matter metals meteor miles mineral mountains natural nearly northern observations obtained occur organic orthoclase osmium oxyd oxygen paper pectolite peculiar Permian phenomena phosphorus pieces plants plates platinum portion potash present Prof radials ratio relations remarkable river rocks ruthenium salt scientific SECOND SERIES Sept silica soda solution southern species specimens strata substance supposed surface temperature Tertiary theory tion upper variation varieties vegetation volume whole XXIX
Pasajes populares
Página 148 - As all the living forms of life are the lineal descendants of those which lived long before the Cambrian epoch, we may feel certain that the ordinary succession by generation has never once been broken, and that no cataclysm has desolated the whole world. Hence we may look with some confidence to a secure future of great length. And as natural selection works solely by and for the good of each being, all corporeal and mental endowments will tend to progress towards perfection.
Página 147 - Judging from the past, we may safely infer that not one living species will transmit its unaltered likeness to a distant futurity. And of the species now living very few will transmit progeny of any kind to a far distant futurity...
Página 148 - I believe that animals have descended from at most only four or five progenitors, and plants from an equal or lesser number.
Página 158 - The limbs divided into great branches, and these into lesser and lesser branches, were themselves once, when the tree was small, budding twigs; and this connexion of the former and present buds by ramifying branches may well represent the classification of all extinct and living species in groups subordinate to groups.
Página 172 - When we travel southward and see a species decreasing in numbers, we may feel sure that the cause lies quite as much in other species being favored as in this one being hurt.
Página 170 - We behold the face of nature bright with gladness, we often see superabundance of food; we do not see, or we forget, that the birds which are idly singing round us mostly live on insects or seeds, and are thus constantly destroying life ; or we forget how largely these songsters, or their eggs, or their nestlings, are destroyed by birds and beasts of prey...
Página 170 - Nothing is easier than to admit in words the truth of the universal struggle for life, or more difficult — at least I have found it so — than constantly to bear this conclusion in mind.
Página 159 - ... extinct and living species in groups subordinate to groups. Of the many twigs which flourished when the tree was a mere bush, only two or three, now grown into great branches, yet survive and bear the other branches ; so with the species which lived during long-past geological periods, very few have left living and modified descendants.
Página 449 - THE BOYDEN PREMIUM URIAH A. BOYDEN, ESQ., of Boston, Mass., has deposited with THE FRANKLIN INSTITUTE the sum of one thousand dollars, to be awarded as a premium to "Any resident of North America who shall determine by experiment whether all rays of light,* and other physical rays, are or are not transmitted with the same velocity.
Página 158 - At each period of growth all the growing twigs have tried to branch out on all sides, and to overtop and kill the surrounding twigs and branches, in the same manner as species and groups of species have at all times overmastered other species in the great battle for life.