The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for LifeWerner Company, Book Manufacturers, 1900 - 538페이지 |
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xxiii 페이지
... tion . But he does not show how selection acts under nature . He believes , like Dean Herbert , that species , when nascent , were more plastic than at present . He lays weight on what he calls the principle of finality , " puissance ...
... tion . But he does not show how selection acts under nature . He believes , like Dean Herbert , that species , when nascent , were more plastic than at present . He lays weight on what he calls the principle of finality , " puissance ...
139 페이지
... tion , proportionally with the number of the native genera and species far more in new genera than in new species . To give a single instance : in the last edition of Dr. Asa Gray's Manual of the Flora of the Northern United States ...
... tion , proportionally with the number of the native genera and species far more in new genera than in new species . To give a single instance : in the last edition of Dr. Asa Gray's Manual of the Flora of the Northern United States ...
205 페이지
... tion has generally been taken advantage of in giving secondary sexual differences to the two sexes of the same species , and specific differences to the several spe- cies of the same genus . Any part or organ developed to an ...
... tion has generally been taken advantage of in giving secondary sexual differences to the two sexes of the same species , and specific differences to the several spe- cies of the same genus . Any part or organ developed to an ...
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adapted advantage allied 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 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 improved increase individuals 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 Red Grouse relation remarked resemble rock-pigeon seeds sexes sexual sexual selection slight stamens structure struggle supposed swimbladder tend tendency tion tree variability variations varieties vary widely wings young