The American Journal of Science and ArtsS. Converse, 1860 |
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Стр. 2
... whole subject of the creation of species by variation , with the aid of the experience derived from my subsequent studies of the Floras of India and Australia in relation to one another and to those of neighboring countries , and of the ...
... whole subject of the creation of species by variation , with the aid of the experience derived from my subsequent studies of the Floras of India and Australia in relation to one another and to those of neighboring countries , and of the ...
Стр. 7
... whole more than Leguminosa , Lythracece , Myrtaceae , or Rosacea , yet members of these present , in all countries , groups of notoriously varying species , as Eucalyptus in Australia , Rosa in Europe , and Lotus , Epilobium , and Rubus ...
... whole more than Leguminosa , Lythracece , Myrtaceae , or Rosacea , yet members of these present , in all countries , groups of notoriously varying species , as Eucalyptus in Australia , Rosa in Europe , and Lotus , Epilobium , and Rubus ...
Стр. 23
... whole globe . Another hypothesis is , that there was a lowering of the mean temperature of the globe wholly inde- pendent of any material change in the present relations of sea and land , which cold induced the glacial epoch . A third ...
... whole globe . Another hypothesis is , that there was a lowering of the mean temperature of the globe wholly inde- pendent of any material change in the present relations of sea and land , which cold induced the glacial epoch . A third ...
Стр. 44
... whole second , and by the position at which it occurs on the circumference of that circle indicates the sixteenths of the whole second . Also , a still further signal , by which account may be taken of the whole seconds , in ways too ...
... whole second , and by the position at which it occurs on the circumference of that circle indicates the sixteenths of the whole second . Also , a still further signal , by which account may be taken of the whole seconds , in ways too ...
Стр. 48
... whole line of stations , but as this would require signal observations for every time observation at any other than the clock station , it would be more convenient to employ a clock at every astronomical station . The question of the ...
... whole line of stations , but as this would require signal observations for every time observation at any other than the clock station , it would be more convenient to employ a clock at every astronomical station . The question of the ...
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Часто встречающиеся слова и выражения
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
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Стр. 172 - 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.
Стр. 144 - 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.
Стр. 143 - 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...
Стр. 154 - The limbs divided into great branches, and these into lesser and lesser branches, were themselves once, when the tree was...
Стр. 166 - 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.
Стр. 166 - 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.
Стр. 170 - 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.
Стр. 155 - ... in a fossil state. As we here and there see a thin straggling branch springing from a fork low down in a tree...
Стр. 445 - 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.
Стр. 154 - 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.