The American Journal of Science and ArtsS. Converse, 1860 |
도서 본문에서
99개의 결과 중 1 - 5개
2 페이지
... present Essay I shall advance the opposite hypothesis , that species are derivative and mutable ; and this chiefly because , whatever opinions a naturalist may have adopted with regard to the origin and variation of species , every ...
... present Essay I shall advance the opposite hypothesis , that species are derivative and mutable ; and this chiefly because , whatever opinions a naturalist may have adopted with regard to the origin and variation of species , every ...
4 페이지
... present appearance and condition . In doing this , however , the believer in species being lineally related forms must employ the same methods of investigation and follow the same principles that guide the believer in their being actual ...
... present appearance and condition . In doing this , however , the believer in species being lineally related forms must employ the same methods of investigation and follow the same principles that guide the believer in their being actual ...
6 페이지
... present all the varieties of a species common to both , nor are the species of any two countries alike in number and ... presents several special characters , and it would require many intermediate forms to effect a graduated change from ...
... present all the varieties of a species common to both , nor are the species of any two countries alike in number and ... presents several special characters , and it would require many intermediate forms to effect a graduated change from ...
7 페이지
... present , in all countries , groups of notoriously varying species , as Eucalyptus in Australia , Rosa in Europe , and Lotus , Epilobium , and Rubus in both Europe and Australia . Again , even genera are divided : of the last named ...
... present , in all countries , groups of notoriously varying species , as Eucalyptus in Australia , Rosa in Europe , and Lotus , Epilobium , and Rubus in both Europe and Australia . Again , even genera are divided : of the last named ...
8 페이지
... present state of our knowledge , absolutely limited orders , and extremely natural ones also ; but their gen- era are to a very eminent degree arbitrarily limited , and their species extremely variable . Orchidee and Leguminosa are also ...
... present state of our knowledge , absolutely limited orders , and extremely natural ones also ; but their gen- era are to a very eminent degree arbitrarily limited , and their species extremely variable . Orchidee and Leguminosa are also ...
목차
1 | |
25 | |
33 | |
43 | |
49 | |
62 | |
68 | |
79 | |
248 | |
268 | |
276 | |
282 | |
294 | |
300 | |
305 | |
326 | |
92 | |
98 | |
111 | |
114 | |
126 | |
139 | |
142 | |
146 | |
152 | |
153 | |
185 | |
199 | |
205 | |
218 | |
335 | |
346 | |
361 | |
383 | |
400 | |
414 | |
421 | |
427 | |
434 | |
441 | |
447 | |
454 | |
456 | |
기타 출판본 - 모두 보기
자주 나오는 단어 및 구문
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
인기 인용구
148 페이지 - 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.
147 페이지 - 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...
148 페이지 - I believe that animals have descended from at most only four or five progenitors, and plants from an equal or lesser number.
158 페이지 - 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.
172 페이지 - 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.
170 페이지 - 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...
170 페이지 - 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.
159 페이지 - ... 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.
449 페이지 - 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.
158 페이지 - 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.