Life on the Earth: Its Origin and SuccessionMacmillan and Company, 1860 - Всего страниц: 224 |
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Стр. 14
... representing the old and new world , we shall find in each the same laws prevail for the same groups ; though none of the species are the same in the two regions , except toward the north pole , where there is almost a connection of the ...
... representing the old and new world , we shall find in each the same laws prevail for the same groups ; though none of the species are the same in the two regions , except toward the north pole , where there is almost a connection of the ...
Стр. 44
... represented by one of three suppositions : -First , that the structure is what we see because that portion of the general type , and that state of the organ or constituent part of the type was selected as suitable for the life of the ...
... represented by one of three suppositions : -First , that the structure is what we see because that portion of the general type , and that state of the organ or constituent part of the type was selected as suitable for the life of the ...
Стр. 46
... represents the life of the earliest historic times , in the same coun- tries , may be ascertained by the slightest examina- tion of the books , sculptures and buried skeletons , which speak of those times . The Swallows , whose ...
... represents the life of the earliest historic times , in the same coun- tries , may be ascertained by the slightest examina- tion of the books , sculptures and buried skeletons , which speak of those times . The Swallows , whose ...
Стр. 58
... 43 32 14 1 3 9 Mesozoic .. 34 Paleozoic . 5 7 — 221 42 22 2 - - 50 70 350 150 32 8 - 14 Pleurotoma . Voluta . Mitra . Cypræa , The numbers representing the several genera in the Cenozoic groups 58 LIFE ON THE EARTH .
... 43 32 14 1 3 9 Mesozoic .. 34 Paleozoic . 5 7 — 221 42 22 2 - - 50 70 350 150 32 8 - 14 Pleurotoma . Voluta . Mitra . Cypræa , The numbers representing the several genera in the Cenozoic groups 58 LIFE ON THE EARTH .
Стр. 59
Its Origin and Succession John Phillips. The numbers representing the several genera in the Cenozoic groups of strata would ... represented in all the great periods of Geology , count the number of species yet disco- vered in them in the ...
Its Origin and Succession John Phillips. The numbers representing the several genera in the Cenozoic groups of strata would ... represented in all the great periods of Geology , count the number of species yet disco- vered in them in the ...
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Часто встречающиеся слова и выражения
according ages ancient animals appear atmosphere Author beds Book British Cenozoic character classes climate cloth Coal coast collected compared considerable continual Crown 8vo Crustacea currents deposits direction distribution earlier earth Edition effect equal evidence example existing fact families feet Fishes force forms fossil genera geological gives globe greater groups growth heat History hypothesis idea indicated influence kind known land laws less limited living marine mass mean measure Mesozoic Mollusca nature nearly observed occur ocean Oolitic organic origin Paleozoic perhaps period plants plants and animals Pleistocene present probably produced proportion races recent regard regions remains remarkable represented require result rivers rocks Second sediments shells similar space species Strata structure successive suppose surface temperature Tertiary thickness tion traced University Upper variations variety waste whole zone
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Стр. 202 - 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.
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Стр. 203 - 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.
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Стр. 202 - 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. 201 - 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. 201 - 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. 203 - 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. 186 - 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.