The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeAppleton, 1898 - 432페이지 |
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vii 페이지
... ORGANS . CLASSIFICATION , groups subordinate to groups - Natural system- Rules and difficulties in classification , explained on the theory of descent with modification - Classification of varieties - De- scent always used in ...
... ORGANS . CLASSIFICATION , groups subordinate to groups - Natural system- Rules and difficulties in classification , explained on the theory of descent with modification - Classification of varieties - De- scent always used in ...
2 페이지
... organs of reproduc- tion in a perfect condition , yet when intercrossed they produce either few or no offspring . Hybrids , on the other hand , have their reproductive organs functionally impotent , as may be clearly seen in the state ...
... organs of reproduc- tion in a perfect condition , yet when intercrossed they produce either few or no offspring . Hybrids , on the other hand , have their reproductive organs functionally impotent , as may be clearly seen in the state ...
19 페이지
... organs in an imperfect con- dition , is a different case from the difficulty of uniting two pure species , which have their reproductive organs perfect ; yet these two distinct classes of cases run to a large extent parallel . Something ...
... organs in an imperfect con- dition , is a different case from the difficulty of uniting two pure species , which have their reproductive organs perfect ; yet these two distinct classes of cases run to a large extent parallel . Something ...
26 페이지
... organs one to another or to the conditions of life . When hybrids are able to breed inter se , they transmit to their off- spring from generation to generation the same com- pounded organisation , and hence we need not be sur- prised ...
... organs one to another or to the conditions of life . When hybrids are able to breed inter se , they transmit to their off- spring from generation to generation the same com- pounded organisation , and hence we need not be sur- prised ...
29 페이지
... organs ; one form having a long pistil with short stamens , the other a short pistil with long stamens ; the two having dif- ferently sized pollen - grains . With trimorphic plants there are three forms likewise differing in the lengths ...
... organs ; one form having a long pistil with short stamens , the other a short pistil with long stamens ; the two having dif- ferently sized pollen - grains . With trimorphic plants there are three forms likewise differing in the lengths ...
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admit affinity allied species ancient animals appear Archipelago arctic areas become believe birds Cambrian changes characters cies classification climate closely allied common progenitor continent crustaceans degree deposited difficulty distant distinct species domestic doubt embryo eral Europe existing extinct fact faunas fertilised fertility flowers formations formerly forms fossil fresh-water Fritz Müller Gärtner genera genus geological period geological record Glacial period groups of species habits hybrids hybrids produced important individuals inhabitants inherited insects instance intermediate intervals land larvæ less living mammals manner marine Marsupials migration modified descendants mongrels mountains natural selection naturalists nearly occur oceanic islands offspring organisation parent parent-form peculiar perfect pistil plants pollen present probably produced quadrupeds reciprocal crosses regions remains remarked reproductive resemblance rocks rudimentary organs sediment seeds Silurian South America stage stamens sterility structure successive suppose terrestrial tertiary theory tion variations varieties whilst widely different wings