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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186 페이지
... marsupial sack secreted a nutritious fluid ; and that these glands were improved in function through natural selection , and concentrated into a confined area , in which case they would have formed a mamma . There is no more difficulty ...
... marsupial sack secreted a nutritious fluid ; and that these glands were improved in function through natural selection , and concentrated into a confined area , in which case they would have formed a mamma . There is no more difficulty ...
291 페이지
... marsupials of that continent . In South America , a similar relationship is manifest , even to an uneducated eye , in the gigantic pieces of armour , like those of the armadillo , found in several parts of La Plata ; and Professor Owen ...
... marsupials of that continent . In South America , a similar relationship is manifest , even to an uneducated eye , in the gigantic pieces of armour , like those of the armadillo , found in several parts of La Plata ; and Professor Owen ...
292 페이지
... marsupials should have been chiefly or solely produced in Australia ; or that Edentata and other American types should have been solely produced in South America . For we know that Europe in ancient times was peopled by numerous marsupials ...
... marsupials should have been chiefly or solely produced in Australia ; or that Edentata and other American types should have been solely produced in South America . For we know that Europe in ancient times was peopled by numerous marsupials ...
344 페이지
... Marsupials - the manner in which the wings of insects are folded -mere colour in certain Algæ -- mere pubescence on parts of the flower in grasses - the nature of the dermal covering , as hair or feathers , in the Vertebrata . If the ...
... Marsupials - the manner in which the wings of insects are folded -mere colour in certain Algæ -- mere pubescence on parts of the flower in grasses - the nature of the dermal covering , as hair or feathers , in the Vertebrata . If the ...
355 페이지
... Marsupial , which will naturally have been more or less inter- mediate in character with respect to all existing Marsupials ; or that both Rodents and Marsupials branched off from a common progenitor , and that both groups have since ...
... Marsupial , which will naturally have been more or less inter- mediate in character with respect to all existing Marsupials ; or that both Rodents and Marsupials branched off from a common progenitor , and that both groups have since ...
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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