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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138 페이지
... plants , and these belonged to eighteen genera and to eight orders , which shows how much these plants differed from each other . So it is with the plants and insects on small and uniform islets : also in small ponds of fresh water ...
... plants , and these belonged to eighteen genera and to eight orders , which shows how much these plants differed from each other . So it is with the plants and insects on small and uniform islets : also in small ponds of fresh water ...
178 페이지
... plants , and Wollaston for insects . New Zealand , for instance , with its lofty mountains and diversified sta- tions , extending over 780 miles of latitude , together with the outlying islands of Auckland , Campbell and Chatham ...
... plants , and Wollaston for insects . New Zealand , for instance , with its lofty mountains and diversified sta- tions , extending over 780 miles of latitude , together with the outlying islands of Auckland , Campbell and Chatham ...
329 페이지
... plants , i . 20 . on plants of Madeira , i . 130 . Helianthemum , i . 272 . Helix pomatia , ii . 187 . resisting salt water , ii . 187 . Helmholtz , M. , on the imperfection of the human eye , i . 255 . Helosciadium , ii . 148 ...
... plants , i . 20 . on plants of Madeira , i . 130 . Helianthemum , i . 272 . Helix pomatia , ii . 187 . resisting salt water , ii . 187 . Helmholtz , M. , on the imperfection of the human eye , i . 255 . Helosciadium , ii . 148 ...
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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