Life on the Earth: Its Origin and SuccessionMacmillan and Company, 1860 - Всего страниц: 224 |
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Стр. 137
... hypothesis founded on probability , or consist- ent even in a small degree with actual phenomena , and the course of natural events , can we assign for the deposition of the fossiliferous strata so short a period as that last mentioned ...
... hypothesis founded on probability , or consist- ent even in a small degree with actual phenomena , and the course of natural events , can we assign for the deposition of the fossiliferous strata so short a period as that last mentioned ...
Стр. 149
... hypothesis of their having lived through long ages in the latitudes of Paris , the Rhine - land , and England . Granting that they in- dicate a warmer climate then prevailing , we may confirm it by the remains of Serpents and Monkeys ...
... hypothesis of their having lived through long ages in the latitudes of Paris , the Rhine - land , and England . Granting that they in- dicate a warmer climate then prevailing , we may confirm it by the remains of Serpents and Monkeys ...
Стр. 151
... hypothesis of Poissons that the solar system in its wandering through space has encountered various temperatures ; we shall find our power of explaining the great dif- ferences of climate , on the same area in ancient and modern times ...
... hypothesis of Poissons that the solar system in its wandering through space has encountered various temperatures ; we shall find our power of explaining the great dif- ferences of climate , on the same area in ancient and modern times ...
Стр. 155
... hypothesis of Sir C. Lyell already alluded to , which attributes change of climate to an alteration in the distribution of land and water , though appa- rently not of much efficacy in exalting the mean temperature of the whole surface ...
... hypothesis of Sir C. Lyell already alluded to , which attributes change of climate to an alteration in the distribution of land and water , though appa- rently not of much efficacy in exalting the mean temperature of the whole surface ...
Стр. 158
... hypotheses on which they are founded , to meet the two objec- tions which follow . 1. The augmentation , here attri- 1 The formula is merely this . Augmentation = A ( rad . — cos . lat . ) . buted to a considerable part at least of the ...
... hypotheses on which they are founded , to meet the two objec- tions which follow . 1. The augmentation , here attri- 1 The formula is merely this . Augmentation = A ( rad . — cos . lat . ) . buted to a considerable part at least of the ...
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abundance affinity ages Ammonites Amorphozoa ancient Annelida antiquity appear atmosphere beds Brachiopoda British Carbon Carboniferous Cenozoic Cenozoic Strata Cephalopoda Cetacea Chalk character classes climate Coal creation Cretaceous Crocodilia Crustacea deposits Devonian Dimyaria distribution earlier earliest earth Echinodermata effect Eocene epoch equal examples existing favourable Fishes forms fossil freshwater Gasteropoda genera genus geological geological periods globe Goniatites groups heat hypothesis idea Insects Invertebrata land Lias limestone limited Lingula living Llandeilo Lower Palæozoic Mammalia marine mean temperature Mesozoic Mesozoic Period modern Oceans Mollusca Monomyaria naturalists nature number of species occur Oolitic organic origin Palæontology Paleozoic Strata perhaps Permian phenomena plants and animals Pleiocene Polyzoa prevalent races radiation recent regard remarkable represented Reptiles rivers rocks sediments shale shells shew Silurian Stonesfield structure succession suppose surface Teleosaurus Tertiary Strata thickness tion traced Uniformitarian Upper variations variety vegetable Vertebrata whole zone Zoophyta دو
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Стр. 194 - 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.
Стр. 195 - There is grandeur in this view of life, with its several powers, having been originally breathed by the Creator into a few forms or into one; and that, whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being evolved.
Стр. 194 - Therefore I should infer from analogy that probably all the organic beings which have ever lived on this earth, have descended from some one primordial form, into which life was first breathed.
Стр. 193 - I formerly entertained, namely, that each species has been independently created, is erroneous. I am fully convinced that species are not immutable; but that those belonging to what are called the same genera are lineal descendants of some other and generally extinct species, in the same manner as the acknowledged varieties of any one species are the descendants of that species. Furthermore, I am convinced that Natural Selection has been the main, but not exclusive, means of modification.
Стр. 193 - 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. 195 - It is interesting to contemplate an entangled bank, clothed with many plants of many kinds, with birds singing on the bushes, with various insects flitting about, and with worms crawling through the damp earth...
Стр. 194 - Nevertheless all living things have much in common, in their chemical composition, their cellular structure, their laws of growth, and their liability to injurious influences.
Стр. 178 - The intermixture of distinct species is guarded against by the aversion of the individuals composing them to sexual union, or by the sterility of the mule offspring. It does not appear that true hybrid races have ever been perpetuated for several generations, even by the assistance of man; for the cases usually cited relate to the crossing of mules with individuals of pure species, and not to the intermixture of hybrid with hybrid.
Стр. 195 - Thus, from the war of nature, from famine and death, the most exalted object which we are capable of conceiving, namely the production of the higher animals, directly follows. There is grandeur in this view of life...
Стр. 192 - I can entertain no doubt, after the most deliberate study and dispassionate judgment of which I am capable, that the view which most naturalists until recently entertained, and which I formerly entertained, namely, that each species has been independently created, is erroneous. I am fully convinced that species are not immutable...