Life on the Earth: Its Origin and SuccessionMacmillan and Company, 1860 - Всего страниц: 224 |
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Стр. 19
... suppose land once continuous between Scotland and Norway , and a climate more severe than the present . Under such circumstances the plants might spread southward ; and afterwards , when the countries were divided and the climate became ...
... suppose land once continuous between Scotland and Norway , and a climate more severe than the present . Under such circumstances the plants might spread southward ; and afterwards , when the countries were divided and the climate became ...
Стр. 40
... suppose for the flying Lizards of the Mesozoic ages a very rapid or very sustained flight , notwithstanding the hollowness of their elongated digital bones , the carinated sternum , and the devotion of a large part of the muscular ...
... suppose for the flying Lizards of the Mesozoic ages a very rapid or very sustained flight , notwithstanding the hollowness of their elongated digital bones , the carinated sternum , and the devotion of a large part of the muscular ...
Стр. 69
... suppose that below the Palæozoics were other earlier strata and earlier systems of life , though they are now all lost in the general metamorphism which has produced the Gneiss and Mica Schist . No one is likely to LIFE ON THE EARTH . 69.
... suppose that below the Palæozoics were other earlier strata and earlier systems of life , though they are now all lost in the general metamorphism which has produced the Gneiss and Mica Schist . No one is likely to LIFE ON THE EARTH . 69.
Стр. 110
... suppose a creation of the same species or the same genera at many separate points . Rejecting this last , we may venture to prefer , as a general explanation , the transfer of the germs of life by natural events , specially by birds ...
... suppose a creation of the same species or the same genera at many separate points . Rejecting this last , we may venture to prefer , as a general explanation , the transfer of the germs of life by natural events , specially by birds ...
Стр. 115
... suppose on their banks many races of animals whose remains , if rare , may nevertheless occur to diligent search on favourable occasions . By such scrupulous attention to the contents of Ironstone nodules at Coalbrook Dale Mr Anstice ...
... suppose on their banks many races of animals whose remains , if rare , may nevertheless occur to diligent search on favourable occasions . By such scrupulous attention to the contents of Ironstone nodules at Coalbrook Dale Mr Anstice ...
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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.