The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for Life, 1-2권D. Appleton, 1917 |
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46 페이지
... favourable to Man's Power of Selection . I will now say a few words on the circumstances , favourable , or the reverse , to man's power of selection . A high degree of variability is obviously favourable , as freely giving the materials ...
... favourable to Man's Power of Selection . I will now say a few words on the circumstances , favourable , or the reverse , to man's power of selection . A high degree of variability is obviously favourable , as freely giving the materials ...
129 페이지
... favourable for the production of new organic forms , we ought to make the comparison within equal times ; and this we are incapable of doing . Although isolation is of great importance in the production of new species , on the whole I ...
... favourable for the production of new organic forms , we ought to make the comparison within equal times ; and this we are incapable of doing . Although isolation is of great importance in the production of new species , on the whole I ...
130 페이지
... favourable and un- favourable for 130 CIRCUMSTANCES FAVOURABLE TO THE [ CHAP . IV .
... favourable and un- favourable for 130 CIRCUMSTANCES FAVOURABLE TO THE [ CHAP . IV .
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adapted affinity allied species ancient animals appear Archipelago beak become believe belonging birds breeds Cambrian cause characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt eggs embryo Europe existing extinct extremely facts favourable fertilised fertility fish flowers formation formerly forms fossil Fritz Müller Gärtner genera genus geological geological period Glacial period gradations groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate land larvæ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly occur oceanic islands offspring organisation parent peculiar perfect pigeon pistil plants pollen present probably produced progenitor quadrupeds ranked reciprocal crosses remarked resemblance seeds Silurian slight South America stage stamens sterility structure successive suppose theory tion variability variations varieties vary whilst whole widely different wings