On the Origin of the Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJohn Murray, 1869 - 596페이지 |
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72개의 결과 중 1 - 5개
xvi 페이지
... tend to progress , in order to account for the existence at the present day of simple productions , he maintains that such forms are now spontaneously generated . * Geoffroy Saint Hilaire , as is stated in his Life , ' written by his ...
... tend to progress , in order to account for the existence at the present day of simple productions , he maintains that such forms are now spontaneously generated . * Geoffroy Saint Hilaire , as is stated in his Life , ' written by his ...
xvii 페이지
... tend to vary in some degree , and , secondly , that agriculturists improve their domesticated animals by selection ; and then , he adds , but what is done in this latter case " by art , seems to be done with equal efficacy , though more ...
... tend to vary in some degree , and , secondly , that agriculturists improve their domesticated animals by selection ; and then , he adds , but what is done in this latter case " by art , seems to be done with equal efficacy , though more ...
5 페이지
... tend to propagate its new and modified form . This fundamental subject of Natural Selection will be treated at some length in the fourth chapter ; and we shall then see how Natural Selection almost inevitably causes much Extinction of ...
... tend to propagate its new and modified form . This fundamental subject of Natural Selection will be treated at some length in the fourth chapter ; and we shall then see how Natural Selection almost inevitably causes much Extinction of ...
13 페이지
... The whole organisation seems to have become plastic , and tends to depart in a slight degree from that of the parental type . Any variation which is not inherited is unimportant for us CHAP . I. 13 UNDER DOMESTICATION .
... The whole organisation seems to have become plastic , and tends to depart in a slight degree from that of the parental type . Any variation which is not inherited is unimportant for us CHAP . I. 13 UNDER DOMESTICATION .
15 페이지
... tends to re - appear in the offspring at a corresponding age , though sometimes earlier . In many cases this could ... tend to appear in the offspring at the same period at which it first appeared in the parent . I believe this rule to ...
... tends to re - appear in the offspring at a corresponding age , though sometimes earlier . In many cases this could ... tend to appear in the offspring at the same period at which it first appeared in the parent . I believe this rule to ...
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accumulated adapted affinities allied species America ancient appear Asa Gray become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt Edition eggs embryo existing exterminated extinct extremely facts favourable females fertilised fertility flowers formation forms fossil Fritz Müller Gärtner genera genus geological Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ less living males mammals manner migration modified descendants natural selection naturalists nearly nest occur oceanic islands offspring organisation parent perfect pigeons pistil pollen Post 8vo present principle probably produced progenitor racters ranked reciprocal crosses remarked resemble seeds sexual sexual selection Silurian slight South America stamens sterility structure struggle successive suppose theory tion variability variations varieties vary vols whole widely