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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39 페이지
... period of life a peculiarity first appears , it tends to reappear in the offspring at a corresponding age , though sometimes earlier . In many cases this could not be otherwise ; thus the inherited . peculiarities in the horns of cattle ...
... period of life a peculiarity first appears , it tends to reappear in the offspring at a corresponding age , though sometimes earlier . In many cases this could not be otherwise ; thus the inherited . peculiarities in the horns of cattle ...
44 페이지
... period than has hitherto been supposed . The lake - inhabitants of Switzerland cultivated several kinds of wheat and barley , the pea , the poppy for oil , and flax ; and they possessed several domesticated animals . They also carried ...
... period than has hitherto been supposed . The lake - inhabitants of Switzerland cultivated several kinds of wheat and barley , the pea , the poppy for oil , and flax ; and they possessed several domesticated animals . They also carried ...
49 페이지
... period at which the 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 ...
... period at which the 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 ...
55 페이지
... period the Dutch were as eager about pigeons as were the old Romans . The paramount impor- tance of these considerations in explaining the immense amount of variation which pigeons have undergone will likewise be obvious when we treat ...
... period the Dutch were as eager about pigeons as were the old Romans . The paramount impor- tance of these considerations in explaining the immense amount of variation which pigeons have undergone will likewise be obvious when we treat ...
62 페이지
... periods of English history choice animals were often imported , and laws were passed to prevent their exportation : the ... period attended to . Savages now sometimes cross their dogs with wild canine animals , to improve the breed , and ...
... periods of English history choice animals were often imported , and laws were passed to prevent their exportation : the ... period attended to . Savages now sometimes cross their dogs with wild canine animals , to improve the breed , and ...
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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