Life on the Earth: Its Origin and SuccessionMacmillan and Company, 1860 - Всего страниц: 224 |
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Стр. 32
... beds of lakes , rivers or the sea . Within reach of the tidal agitation , where the water is well charged with air , several races of Mollusca attach themselves - as the young oyster by its lower shell fixes itself permanently and fur ...
... beds of lakes , rivers or the sea . Within reach of the tidal agitation , where the water is well charged with air , several races of Mollusca attach themselves - as the young oyster by its lower shell fixes itself permanently and fur ...
Стр. 49
... bed of the actual valley . It lies in what must have been the course of the great floods of some earlier time , under other geographical conditions , before the actual river- channel was sunk to its present level . In this gravel have ...
... bed of the actual valley . It lies in what must have been the course of the great floods of some earlier time , under other geographical conditions , before the actual river- channel was sunk to its present level . In this gravel have ...
Стр. 52
... beds of Wales , is assumed to be 10 miles , 52800 ft . That is not the maximum thickness , which in Britain is supposed by Ramsay to be 72584 ft . In his estimate the Palæ- ozoic beds are taken much above the average , and the Cenozoic beds ...
... beds of Wales , is assumed to be 10 miles , 52800 ft . That is not the maximum thickness , which in Britain is supposed by Ramsay to be 72584 ft . In his estimate the Palæ- ozoic beds are taken much above the average , and the Cenozoic beds ...
Стр. 63
... 49 15 113 3 In this diagram the Passage Beds are taken at 500. PASSAGE . LUDLOW . WENLOCK . LLANDOVERY . CARADOC . LLANDEILO . LINGULA . 1 1 Fig . 3 . PALEOZOIC LIFE . CENOZOIC LIFE . MESOZOIC LIFE . Fig LIFE ON THE EARTH . 63.
... 49 15 113 3 In this diagram the Passage Beds are taken at 500. PASSAGE . LUDLOW . WENLOCK . LLANDOVERY . CARADOC . LLANDEILO . LINGULA . 1 1 Fig . 3 . PALEOZOIC LIFE . CENOZOIC LIFE . MESOZOIC LIFE . Fig LIFE ON THE EARTH . 63.
Стр. 64
... beds to a maximum in the upper part of the Wenlock series , and dies out almost to zero in the beds of Passage to the Old Red Sandstone system above . What is here said of the Siluro - Cambrian or Lower Palæozoic Strata may be repeated ...
... beds to a maximum in the upper part of the Wenlock series , and dies out almost to zero in the beds of Passage to the Old Red Sandstone system above . What is here said of the Siluro - Cambrian or Lower Palæozoic Strata may be repeated ...
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affinity ages Ammonites Amorphozoa ancient Annelida appear atmosphere beds Brachiopoda British BROOKE FOSS WESTCOTT Carbon Carboniferous Cenozoic Cenozoic Strata Cephalopoda Cetacea Chalk classes Clay climate cloth creation Cretaceous Crocodilia Crown 8vo Crustacea deposits Dimyaria distribution earlier earliest earth Echinodermata effect English epoch equal examples existing Fcap Fishes forms fossil freshwater Gasteropoda genera genus geological gilt leaves globe Goniatites groups heat History hypothesis Insects land Lias limestone limited Lingula living Llandeilo Mammalia marine mean temperature Mesozoic Mesozoic Period modern Oceans Mollusca Monomyaria naturalists nature number of species occur Oolitic organic origin Paleozoic Paleozoic Strata perhaps phenomena plants and animals Polyzoa prevalent Professor races recent regard remarkable Reptiles rivers rocks Royal 16mo Second Edition sediments Sermons shells shew Silurian Stonesfield Strata structure succession suppose surface Teleosaurus thickness tion traced University of Cambridge Upper variations vegetable whole zone Zoophyta وو
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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.