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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ix 페이지
... present editions on various subjects , according as the evidence has become somewhat stronger or weaker . The more important corrections and some additions in the present volume are tabulated on the following page , for the convenience ...
... present editions on various subjects , according as the evidence has become somewhat stronger or weaker . The more important corrections and some additions in the present volume are tabulated on the following page , for the convenience ...
194 페이지
... present analogous Variations , so that a Variety of one Species often assumes a Character proper to an allied Species , or reverts to some of the Characters of an early Progenitor . - These propositions will be most readily understood ...
... present analogous Variations , so that a Variety of one Species often assumes a Character proper to an allied Species , or reverts to some of the Characters of an early Progenitor . - These propositions will be most readily understood ...
122 페이지
... present character of the southern half of the con- tinent ; and the southern half was formerly more closely ́allied , than it is at present , to the northern half . In a similar manner we know , from Falconer and Cautley's discoveries ...
... present character of the southern half of the con- tinent ; and the southern half was formerly more closely ́allied , than it is at present , to the northern half . In a similar manner we know , from Falconer and Cautley's discoveries ...
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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