Life on the Earth: Its Origin and SuccessionMacmillan and Company, 1860 - 224 стор. |
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Сторінка 14
... gives the zones in succession downwards . The second gives the limits of the zone in depth by fathoms . The third , the depth in thickness of each zone in fathoms . The fourth the number of species found in each zone . The fifth is a ...
... gives the zones in succession downwards . The second gives the limits of the zone in depth by fathoms . The third , the depth in thickness of each zone in fathoms . The fourth the number of species found in each zone . The fifth is a ...
Сторінка 17
... give full effect to that mixture ; the greatest amount of stimulating light , and the greatest change of daily temperature ; we shall readily conceive that near the surface the forms of life should be both more varied and more abund ...
... give full effect to that mixture ; the greatest amount of stimulating light , and the greatest change of daily temperature ; we shall readily conceive that near the surface the forms of life should be both more varied and more abund ...
Сторінка 20
... gives place to a Chinese and Malayan flora , West of the Himalaya , mountain - plants of the European type occur at several points , ideally connecting this range with the coasts of the Levant and the Black Sea , and really indicative ...
... gives place to a Chinese and Malayan flora , West of the Himalaya , mountain - plants of the European type occur at several points , ideally connecting this range with the coasts of the Levant and the Black Sea , and really indicative ...
Сторінка 33
... gives the boat - like form which fits them for motion in water . Swimming , though chiefly exhibited by the Arti- culated and Vertebrated divisions of animals , is some- times exercised by the other types . Some of the Infusoria swim by ...
... gives the boat - like form which fits them for motion in water . Swimming , though chiefly exhibited by the Arti- culated and Vertebrated divisions of animals , is some- times exercised by the other types . Some of the Infusoria swim by ...
Сторінка 35
... gives remarkable power of quick turning , suitable to its way of life . Diving . The same backward position of the propulsive organs is even more remarkable in the case of the diving birds , such as Colymbus , Uria , Aptenodytes , whose ...
... gives remarkable power of quick turning , suitable to its way of life . Diving . The same backward position of the propulsive organs is even more remarkable in the case of the diving birds , such as Colymbus , Uria , Aptenodytes , whose ...
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Загальні терміни та фрази
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
Популярні уривки
Сторінка 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.
Сторінка 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.
Сторінка 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.
Сторінка 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.
Сторінка 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.
Сторінка 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...
Сторінка 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.
Сторінка 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.
Сторінка 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...
Сторінка 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...