The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for LifeD. Appleton, 1904 - 435페이지 |
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8 페이지
... same manner . It is extremely difficult to come to any conclusion in regard to the extent of the changes which have been thus definitely induced . There can , however , be little doubt 8 VARIATION UNDER DOMESTICATION . [ CHAP . I.
... same manner . It is extremely difficult to come to any conclusion in regard to the extent of the changes which have been thus definitely induced . There can , however , be little doubt 8 VARIATION UNDER DOMESTICATION . [ CHAP . I.
9 페이지
... , whether extremely slight or strongly marked , which appear amongst many individuals living together , may be considered as the indefinite effects of the conditions of life on CHAP . I. ] VARIATION UNDER DOMESTICATION .
... , whether extremely slight or strongly marked , which appear amongst many individuals living together , may be considered as the indefinite effects of the conditions of life on CHAP . I. ] VARIATION UNDER DOMESTICATION .
10 페이지
... extremely sensitive to any change in the conditions , and partly from the similarity , as Kölreuter and others have remarked , between the variability which follows from the crossing of distinct species , and that which may be observed ...
... extremely sensitive to any change in the conditions , and partly from the similarity , as Kölreuter and others have remarked , between the variability which follows from the crossing of distinct species , and that which may be observed ...
37 페이지
... extremely alike the flowers ; how unlike the flowers of the heartsease are , and how alike the leaves ; how much the fruit of the different kinds of goose- berries differ in size , colour , shape , and CHAP . I. ] 37 SELECTION BY MAN .
... extremely alike the flowers ; how unlike the flowers of the heartsease are , and how alike the leaves ; how much the fruit of the different kinds of goose- berries differ in size , colour , shape , and CHAP . I. ] 37 SELECTION BY MAN .
44 페이지
... extremely small differences , and it is in human nature to value any novelty , however slight , in one's own possession . Nor must the value which would formerly have been set on any slight differences in the individuals of the same ...
... extremely small differences , and it is in human nature to value any novelty , however slight , in one's own possession . Nor must the value which would formerly have been set on any slight differences in the individuals of the same ...
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adapted affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period 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 males mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion trees variability variations varieties vary whilst whole wings young