The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJ. Murray, 1920 - 432페이지 |
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xii 페이지
... marsupial animals . On serial homologies , corrected . 518 361 520 362 521 363 541 377 547 552 381 384 568 395 572 398 Mr. E. Ray Lankester on morphology . On the asexual reproduction of Chironomus . On the origin of rudimentary parts ...
... marsupial animals . On serial homologies , corrected . 518 361 520 362 521 363 541 377 547 552 381 384 568 395 572 398 Mr. E. Ray Lankester on morphology . On the asexual reproduction of Chironomus . On the origin of rudimentary parts ...
84 페이지
... marsupials , which are divided into groups differing but little from each other , and feebly representing , as Mr. Waterhouse and others have remarked , our carnivorous , ruminant , and rodent mammals , could successfully compete with ...
... marsupials , which are divided into groups differing but little from each other , and feebly representing , as Mr. Waterhouse and others have remarked , our carnivorous , ruminant , and rodent mammals , could successfully compete with ...
93 페이지
... marsupials , edentata , and rodents , co - exist in South America in the same region with nume- rous monkeys , and probably interfere little with each other . Although organisation , on the whole , may have advanced and be still ...
... marsupials , edentata , and rodents , co - exist in South America in the same region with nume- rous monkeys , and probably interfere little with each other . Although organisation , on the whole , may have advanced and be still ...
177 페이지
... marsupial form ; and if so , the mammary glands will have been at first developed within the marsupial sack . In the case of the fish ( Hippocampus ) the eggs are hatched , and the young are reared for a time , within a sack of this ...
... marsupial form ; and if so , the mammary glands will have been at first developed within the marsupial sack . In the case of the fish ( Hippocampus ) the eggs are hatched , and the young are reared for a time , within a sack of this ...
178 페이지
... marsupial form ) , " this at least perfectly innocent and harmless structure ? " It may be suggested in answer that the voice , which is certainly of high importance to many animals , could hardly have been used with full force as long ...
... marsupial form ) , " this at least perfectly innocent and harmless structure ? " It may be suggested in answer that the voice , which is certainly of high importance to many animals , could hardly have been used with full force as long ...
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accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species domestic animals doubt effects eggs embryo existing extinct extremely fact favourable female fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed tend theory tion variability variations varieties vary whilst whole wings young