Life on the Earth: Its Origin and SuccessionMacmillan and Company, 1860 - 224 من الصفحات |
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الصفحة 20
... characters during all the time of the existence of each race ; these characters have survived the chances of long Flora Indica . Introductory Essay , 108 . migration , have traversed large tracts without hy- bridism , 20 LIFE ON THE ...
... characters during all the time of the existence of each race ; these characters have survived the chances of long Flora Indica . Introductory Essay , 108 . migration , have traversed large tracts without hy- bridism , 20 LIFE ON THE ...
الصفحة 24
... characters , through length of time , change of con- ditions , mixture with other races , or any of the innumerable incidents of the ' struggle for existence . ' I have thus , Mr Vice - Chancellor , recapitulated some of the laws ...
... characters , through length of time , change of con- ditions , mixture with other races , or any of the innumerable incidents of the ' struggle for existence . ' I have thus , Mr Vice - Chancellor , recapitulated some of the laws ...
الصفحة 26
... characters of agreement we often call typical , the special characters of difference are often called adaptive - terms which imply the recognition of law and modification , mind and choice - a Creator who works by rule , and who has ...
... characters of agreement we often call typical , the special characters of difference are often called adaptive - terms which imply the recognition of law and modification , mind and choice - a Creator who works by rule , and who has ...
الصفحة 32
... character . Perhaps this is also the case with the suspensional ligament of Lingula and Terebratula . More curious examples are furnished by the cusps for adhesion which cover the arms of Cephalo- poda1 , both recent and fossil , and ...
... character . Perhaps this is also the case with the suspensional ligament of Lingula and Terebratula . More curious examples are furnished by the cusps for adhesion which cover the arms of Cephalo- poda1 , both recent and fossil , and ...
الصفحة 44
... character , may furnish a basis for sound judgment . Without such reference a choice no doubt will be often made , but it can then be little better than prejudice , and must be expected to differ in different persons , according to the ...
... character , may furnish a basis for sound judgment . Without such reference a choice no doubt will be often made , but it can then be little better than prejudice , and must be expected to differ in different persons , according to the ...
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عبارات ومصطلحات مألوفة
abundance affinity Ammonites Amorphozoa ancient Annelida antiquity appear atmosphere beds Belemnites Brachiopoda British Cænozoic Strata Carbon Carboniferous Cephalopoda Cetacea Chalk character classes climate Coal creation Cretaceous Crocodilia Crustacea deposits 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 Ichthyosaurus Insects Invertebrata land Lias limestone limited Lingula living Llandeilo Lower Palæozoic Strata Mammalia marine mean temperature Mesozoic Mesozoic Period Mesozoic Strata modern Oceans Mollusca Monomyaria naturalists nature number of species occur Oolitic organic origin Palæozoic ages 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 Terebratula thickness tion traced Uniformitarian Upper variations variety vegetable Vertebrata whole zone Zoophyta دو دو دو
مقاطع مشهورة
الصفحة 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.
الصفحة 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.
الصفحة 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.
الصفحة 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.
الصفحة 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.
الصفحة 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...
الصفحة 202 - 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.
الصفحة 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.
الصفحة 203 - 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...
الصفحة 200 - 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...