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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v 페이지
... vary most Species of the larger genera in each country vary more frequently than the species of the smaller genera Many of the species of the larger genera resemble varieties in being very closely , but un- equally , related to each ...
... vary most Species of the larger genera in each country vary more frequently than the species of the smaller genera Many of the species of the larger genera resemble varieties in being very closely , but un- equally , related to each ...
vii 페이지
... vary in an analogous manner · Reversions to long - lost characters - Summary Page 165-206 — CHAPTER VI . DIFFICULTIES OF THE THEORY . - Difficulties of the theory of descent with modification - Transitions Absence or rarity of ...
... vary in an analogous manner · Reversions to long - lost characters - Summary Page 165-206 — CHAPTER VI . DIFFICULTIES OF THE THEORY . - Difficulties of the theory of descent with modification - Transitions Absence or rarity of ...
xvii 페이지
... 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 slowly ...
... 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 slowly ...
4 페이지
... vary however slightly in any manner profitable to itself , under the complex and sometimes varying conditions of life , will have a better chance of surviving , and thus be 4 INTRODUCTION .
... vary however slightly in any manner profitable to itself , under the complex and sometimes varying conditions of life , will have a better chance of surviving , and thus be 4 INTRODUCTION .
7 페이지
... vary , it generally con- tinues varying for many generations . No case is on CHAP . I. བ VARIATION UNDER DOMESTICATION . 7 II.
... vary , it generally con- tinues varying for many generations . No case is on CHAP . I. བ VARIATION UNDER DOMESTICATION . 7 II.
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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