On the Origin of the Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJohn Murray, 1869 - 596페이지 |
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34 페이지
... effected is proved by the enormous prices given for animals with a good pedigree ; and these have now been exported to almost every quarter of the world . The improvement is by no means generally due to crossing different breeds ; all ...
... effected is proved by the enormous prices given for animals with a good pedigree ; and these have now been exported to almost every quarter of the world . The improvement is by no means generally due to crossing different breeds ; all ...
37 페이지
... is known that the English pointer has been greatly changed within the last century , and in this case the change has , it is believed , been chiefly effected by crosses with the fox- CHAP . I. 37 UNCONSCIOUS SELECTION .
... is known that the English pointer has been greatly changed within the last century , and in this case the change has , it is believed , been chiefly effected by crosses with the fox- CHAP . I. 37 UNCONSCIOUS SELECTION .
38 페이지
... effected by crosses with the fox- hound ; but what concerns us is , that the change has been effected unconsciously and gradually , and yet so effectually , that , though the old Spanish pointer cer- tainly came from Spain , Mr. Borrow ...
... effected by crosses with the fox- hound ; but what concerns us is , that the change has been effected unconsciously and gradually , and yet so effectually , that , though the old Spanish pointer cer- tainly came from Spain , Mr. Borrow ...
44 페이지
... effected . I have seen it gravely remarked , that it was most fortunate that the strawberry began to vary just when gardeners began to attend closely to this plant . No doubt the strawberry had always varied since it was cultivated ...
... effected . I have seen it gravely remarked , that it was most fortunate that the strawberry began to vary just when gardeners began to attend closely to this plant . No doubt the strawberry had always varied since it was cultivated ...
51 페이지
... effected only by slow degrees ; yet recently Sir J. Lubbock has shown a degree of variability in these main nerves in Coccus , which may almost be compared to the irregular branching of the stem of a tree . This philosophical naturalist ...
... effected only by slow degrees ; yet recently Sir J. Lubbock has shown a degree of variability in these main nerves in Coccus , which may almost be compared to the irregular branching of the stem of a tree . This philosophical naturalist ...
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accumulated adapted affinities allied species America ancient appear Asa Gray become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt Edition eggs embryo existing exterminated extinct extremely facts favourable females fertilised fertility flowers formation forms fossil Fritz Müller Gärtner genera genus geological Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ less living males mammals manner migration modified descendants natural selection naturalists nearly nest occur oceanic islands offspring organisation parent perfect pigeons pistil pollen Post 8vo present principle probably produced progenitor racters ranked reciprocal crosses remarked resemble seeds sexual sexual selection Silurian slight South America stamens sterility structure struggle successive suppose theory tion variability variations varieties vary vols whole widely