The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for LifeP.F. Collier & son, 1902 - 356페이지 |
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5 페이지
... perfect - The law of Unity of Type and of the Conditions of Existence embraced by the theory of Natural Selection CHAPTER VII MISCELLANEOUS OBJECTIONS TO THE THEORY OF NATURAL SELECTION Longevity - Modifications not necessarily ...
... perfect - The law of Unity of Type and of the Conditions of Existence embraced by the theory of Natural Selection CHAPTER VII MISCELLANEOUS OBJECTIONS TO THE THEORY OF NATURAL SELECTION Longevity - Modifications not necessarily ...
12 페이지
... perfect gradation of forms in certain groups , and by the analogy of domestic produc- tions . With respect to the means of modification , he attributed something to the direct action of the physical conditions of life , something to the ...
... perfect gradation of forms in certain groups , and by the analogy of domestic produc- tions . With respect to the means of modification , he attributed something to the direct action of the physical conditions of life , something to the ...
40 페이지
... perfect reversion had ensued . It would be necessary , in order to prevent the effects of intercrossing , that only a single variety should have been turned loose in its new home . Never- theless , as our varieties certainly do ...
... perfect reversion had ensued . It would be necessary , in order to prevent the effects of intercrossing , that only a single variety should have been turned loose in its new home . Never- theless , as our varieties certainly do ...
42 페이지
... perfect fertility of varieties when crossed - a subject hereafter to be discussed ) , domestic races of the same species differ from each other in the same manner as do the closely - allied species of the same genus in a state of nature ...
... perfect fertility of varieties when crossed - a subject hereafter to be discussed ) , domestic races of the same species differ from each other in the same manner as do the closely - allied species of the same genus in a state of nature ...
49 페이지
... perfect plumage is acquired varies , as does the state of the down with which the nestling birds are clothed when hatched . The shape and size of the eggs vary . The manner of flight , and in some breeds the voice and disposition ...
... perfect plumage is acquired varies , as does the state of the down with which the nestling birds are clothed when hatched . The shape and size of the eggs vary . The manner of flight , and in some breeds the voice and disposition ...
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adapted admit affinities allied species America analogous ancient animals appear beak become bees believe belonging birds breeds cause cells characters climate closely allied color common continent crossed crustaceans degree developed difficulty distinct species domestic doubt eggs embryo existing extinct extremely facts favorable fertility flowers formation forms fossil Fritz Müller genera genus geological Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner marsupial migration modification modified descendants natural selection naturalists nearly nest offspring organs ORIGIN OF SPECIES paleozoic parent peculiar perfect pigeon pistil plants pollen present principle probably produced progenitor quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder theory tion trees variability variations varieties vary whole wings young