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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107 페이지
... extinct species can all be classed either in still existing groups , or between them . That the extinct forms of life help to fill up the in- tervals between existing genera , families , and orders , is certainly true ; but as this ...
... extinct species can all be classed either in still existing groups , or between them . That the extinct forms of life help to fill up the in- tervals between existing genera , families , and orders , is certainly true ; but as this ...
110 페이지
... extinct . The three existing genera a11 , q14 , p1 , will form a small family ; b1 and f11 a closely allied family or sub - family ; and o11 , e11 , m11 , a third ... extinction and 110 AFFINITIES OF EXTINCT SPECIES . [ CHAP . XL fourth.
... extinct . The three existing genera a11 , q14 , p1 , will form a small family ; b1 and f11 a closely allied family or sub - family ; and o11 , e11 , m11 , a third ... extinction and 110 AFFINITIES OF EXTINCT SPECIES . [ CHAP . XL fourth.
111 페이지
... extinct forms supposed to be imbedded in the successive formations , were discovered at several points low down in the series , the three existing families on the uppermost line would be rendered less distinct from each other . If , for ...
... extinct forms supposed to be imbedded in the successive formations , were discovered at several points low down in the series , the three existing families on the uppermost line would be rendered less distinct from each other . If , for ...
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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