The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeF. Ungar Publishing Company, 1956 - 134페이지 |
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78 페이지
... affinity means the general resemblance be- tween species in structure and constitution . Now fertility is largely governed by systematic affinity . This is shown by hybrids never having been raised between distinct families , and by ...
... affinity means the general resemblance be- tween species in structure and constitution . Now fertility is largely governed by systematic affinity . This is shown by hybrids never having been raised between distinct families , and by ...
112 페이지
... affinity of their mam- malian inhabitants . The Malay Archipelago is traversed by a space of deep ocean , and this separates two widely distinct mammalian faunas . On either side , the islands stand on a shallow bank ; these are ...
... affinity of their mam- malian inhabitants . The Malay Archipelago is traversed by a space of deep ocean , and this separates two widely distinct mammalian faunas . On either side , the islands stand on a shallow bank ; these are ...
120 페이지
... affinity to a quite distinct group , this affinity in most cases is general and not special ; thus , of all Rodents , the bizcacha is most nearly related to Marsupials ; but in the points in which it approaches this order , its ...
... affinity to a quite distinct group , this affinity in most cases is general and not special ; thus , of all Rodents , the bizcacha is most nearly related to Marsupials ; but in the points in which it approaches this order , its ...
목차
Variation under Domestication | 1 |
Variation under Nature | 12 |
Struggle for Existence | 19 |
저작권 | |
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accumulated adapted affinity allied species animals aphides appear areas become believe birds breeds Cambrian characters CHARLES DARWIN climate closely allied common continent crossed crustaceans cuckoo Darwin degree descended developed difficulty distinct species disuse domestic effects eggs embryo embryology eminently liable existing extermination extinct extremely fact favourable females fertilised fertility flower formations fossil genera genus geological geological period giraffe gradations greater number groups habits Hence hybrids hybrids produced important increase individuals inhabitants inheritance insects instance instincts intercrossing intermediate intervals islands larvae less living males mammals manner Marsupials migration Mivart modification natural selection naturalists nearly nest neuters occasional offspring organisation Origin of Species parent perfect pigeon plants pollen probably produced progenitor pupae quadrupeds rank reciprocal crosses reproductive systems resemblance rock-pigeon rudimentary organs seeds sexual selection slaves slight stage sterility structure struggle swimbladder tend tendency theory of natural tion variability variations varieties vary widely young