The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, 1권D. Appleton, 1898 |
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36개의 결과 중 1 - 5개
vii 페이지
... perfect - The law of Unity of Type and of the Conditions of Existence embraced by the theory of Natu- ral Selection . . 207 CHAPTER VII . MISCELLANEOUS OBJECTIONS TO THE THEORY OF NATURAL SELECTION . Longevity - Modifications not ...
... perfect - The law of Unity of Type and of the Conditions of Existence embraced by the theory of Natu- ral Selection . . 207 CHAPTER VII . MISCELLANEOUS OBJECTIONS TO THE THEORY OF NATURAL SELECTION . Longevity - Modifications not ...
xiv 페이지
... perfect gradation of forms in certain groups , and by the analogy of domestic produc- tions . With respect to the means of modification , he attributed something to the direct action of the physical conditions of life , something to the ...
... perfect gradation of forms in certain groups , and by the analogy of domestic produc- tions . With respect to the means of modification , he attributed something to the direct action of the physical conditions of life , something to the ...
17 페이지
... perfect reversion had ensued . It would be neces- sary , in order to prevent the effects of intercrossing , that only a single variety should have been turned loose in its new home . Nevertheless , as our varieties . certainly do ...
... perfect reversion had ensued . It would be neces- sary , in order to prevent the effects of intercrossing , that only a single variety should have been turned loose in its new home . Nevertheless , as our varieties . certainly do ...
18 페이지
... perfect fertility of varieties when crossed , a subject hereafter to be discussed ) , domestic races of the same species differ from each other in the same manner as do the closely- allied species of the same genus in a state of nature ...
... perfect fertility of varieties when crossed , a subject hereafter to be discussed ) , domestic races of the same species differ from each other in the same manner as do the closely- allied species of the same genus in a state of nature ...
25 페이지
... perfect plumage is acquired varies , as does the state of the down with which the nestling birds are clothed when hatched . The shape and size of the eggs vary . The manner of flight , and in some breeds the voice and disposition ...
... perfect plumage is acquired varies , as does the state of the down with which the nestling birds are clothed when hatched . The shape and size of the eggs vary . The manner of flight , and in some breeds the voice and disposition ...
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adapted advantage allied analogous animals and plants appear Asa Gray beak become bees believe birds breeds caudicle cause cells characters climate closely colour common crossed cuckoo degree descendants developed difficulty distinct species disuse divergence domestic animals domestic races doubt effects eggs existence extinct extremely facts favourable females flowers forms Fritz Müller genera genus giraffe gradations greater number groups habits Hence hermaphrodites hive-bee important increase inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ large number larger genera larvæ less males manner Melipona Mivart modified natural selection naturalists nearly nest occasionally offspring organisation organs origin Origin of Species parent perfect period pigeons pollen pollen-grains present preserved prey principle probably produced progenitor quadrupeds rank rarely Red Grouse relation remarked resemble rock-pigeon seeds sexes sexual selection slight stamens striped structure struggle supposed swimbladder tend tendency tion tree variability variations varieties vary widely wings young