On the Origin of Species by Means of Natural Selection: Or The Preservation of Favored Races in the Struggle for Life, 2권D. Appleton, 1888 - 458페이지 |
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82개의 결과 중 1 - 5개
xii 페이지
... modified . On the modification of the eye . Transitions through the acceleration or retardation of the period of reproduction . The account of the electric organ of fishes added to . Analogical resemblance between the eyes of ...
... modified . On the modification of the eye . Transitions through the acceleration or retardation of the period of reproduction . The account of the electric organ of fishes added to . Analogical resemblance between the eyes of ...
xix 페이지
... modified ; and he attributes the modification to the change of circumstances . The author ( 1855 ) has also treated Psychology on the principle of the necessary acquirement of each mental power and capacity by gradation . In 1852 M ...
... modified ; and he attributes the modification to the change of circumstances . The author ( 1855 ) has also treated Psychology on the principle of the necessary acquirement of each mental power and capacity by gradation . In 1852 M ...
xxi 페이지
... modification of pre - existing species - a hypothesis which , though unproven , and sadly damaged by some of its supporters , is yet the only one to which physiology lends any countenance ; their existence would seem to show that the ...
... modification of pre - existing species - a hypothesis which , though unproven , and sadly damaged by some of its supporters , is yet the only one to which physiology lends any countenance ; their existence would seem to show that the ...
3 페이지
... modification and coadaptation . At the commence- ment of my observations it seemed to me probable that a careful study ... modified form . This fundamental subject of Natural Selection will be treated at some length in the fourth chapter ...
... modification and coadaptation . At the commence- ment of my observations it seemed to me probable that a careful study ... modified form . This fundamental subject of Natural Selection will be treated at some length in the fourth chapter ...
6 페이지
... modified in the 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 about many slight changes , such as ...
... modified in the 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 about many slight changes , such as ...
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adapted admit affinities allied species America analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly nest occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked reproductive resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed tend theory tion variability variations varieties vary whilst whole wings young