The American Journal of Science and ArtsS. Converse, 1860 |
도서 본문에서
100개의 결과 중 1 - 5개
5 페이지
... amount of uniformity , the lowest degree of such relationship ; and the facts that individuals are more easily grouped into species limited by characters , than into varieties , or than species are into limitable genera or groups of ...
... amount of uniformity , the lowest degree of such relationship ; and the facts that individuals are more easily grouped into species limited by characters , than into varieties , or than species are into limitable genera or groups of ...
8 페이지
... amount of variation is differently manifested at different epochs in the history of the group . Thus , if a genus is numerically in- creasing , and consequently running into varieties , it will present a group of species with complex ...
... amount of variation is differently manifested at different epochs in the history of the group . Thus , if a genus is numerically in- creasing , and consequently running into varieties , it will present a group of species with complex ...
14 페이지
... amount of space and annual supply of food for each species ( or other group of individuals ) is limited and constant , but that the increase of all organisms tends to proceed annually in a geometrical ratio ; and that , as the sum of ...
... amount of space and annual supply of food for each species ( or other group of individuals ) is limited and constant , but that the increase of all organisms tends to proceed annually in a geometrical ratio ; and that , as the sum of ...
18 페이지
... amount of the fluctuations of these conflicting conditions in a given country , nor if we could can we express them symboli- cally or otherwise so as to make them intelligible exponents of the amount of variety in the vegetation they ...
... amount of the fluctuations of these conflicting conditions in a given country , nor if we could can we express them symboli- cally or otherwise so as to make them intelligible exponents of the amount of variety in the vegetation they ...
20 페이지
... amount of peculiarity are the Society group and Fijis , both of which are sinking . In the pres- ent state of our knowledge it is not safe to lay much stress on these apparent facts , especially as the New Hebrides and New Caledonia ...
... amount of peculiarity are the Society group and Fijis , both of which are sinking . In the pres- ent state of our knowledge it is not safe to lay much stress on these apparent facts , especially as the New Hebrides and New Caledonia ...
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기타 출판본 - 모두 보기
자주 나오는 단어 및 구문
acid Alethopteris American animals antimony appears arsenic atomic atomic weight aurora axis ball bismuth Brgt bright carbon carbonic acid Carboniferous character chemical clouds coal coast color containing Cretaceous crystals described determined diameter Dicotyledons direction east existence extended fact feet flame flora fossil genera genus geological give Gulf Stream heat horizon inches Jour Journal Lake Lepidodendron less light limestone Lsqx mass matter means metals meteor miles mineral motion mountains natural nearly nebular hypothesis Neuropteris northern observations obtained organic origin osmium oxyd oxygen Pecopteris peculiar phenomena plants plates platinum portion potash present produced Prof relations remarkable river rocks ruthenium sandstone scientific SECOND SERIES seen Sept shales species specimens Sphenopteris strata stream streamers substance supposed surface temperature theory thickness tion variation varieties vegetation velocity whole zenith
인기 인용구
172 페이지 - I cannot doubt that the theory of descent with modification embraces all the members of the same great class or kingdom. I believe that animals are descended from at most only four or five progenitors, and plants from an equal or lesser number.
144 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.
143 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...
154 페이지 - The limbs divided into great branches, and these into lesser and lesser branches, were themselves once, when the tree was...
166 페이지 - There is no exception to the rule that every organic being naturally increases at so high a rate that, if not destroyed, the earth would soon be covered by the progeny of a single pair.
166 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.
170 페이지 - But if variations useful to any organic being ever do occur, assuredly individuals thus characterised will have the best chance of being preserved in the struggle for life ; and from the strong principle of inheritance, these will tend to produce offspring similarly characterised. This principle of preservation, or the survival of the fittest, I have called Natural Selection.
155 페이지 - ... in a fossil state. As we here and there see a thin straggling branch springing from a fork low down in a tree...
445 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.
154 페이지 - The green and budding twigs may represent existing species ; and those produced during former years may represent the long succession of extinct species. 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.