On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeEaston Press, 1976 - 470 páginas |
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Página 244
... namely Kölreuter and Gärtner , arrived at diametrically opposite conclusions in regard to some of the very same forms . It is also most instructive to compare — but I have not space here to enter on details the evidence advanced by our ...
... namely Kölreuter and Gärtner , arrived at diametrically opposite conclusions in regard to some of the very same forms . It is also most instructive to compare — but I have not space here to enter on details the evidence advanced by our ...
Página 332
... namely , whether the several species of a genus which must on our theory all be descended from a common progenitor , can have migrated , undergoing modification during their migration , from some one area . If , when most of the species ...
... namely , whether the several species of a genus which must on our theory all be descended from a common progenitor , can have migrated , undergoing modification during their migration , from some one area . If , when most of the species ...
Página 364
... namely , between the depth of the sea separating islands from each other or from the nearest continent , and the degree of affinity of their mammalian inhabitants . Mr. Windsor Earl has made some striking observations on this head ...
... namely , between the depth of the sea separating islands from each other or from the nearest continent , and the degree of affinity of their mammalian inhabitants . Mr. Windsor Earl has made some striking observations on this head ...
Contenido
VARIATION UNDER NATURE | 30 |
STRUGGLE FOR EXISTENCE | 45 |
NATURAL SELECTION | 59 |
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Términos y frases comunes
accumulated adapted admit affinities allied species America ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common progenitor continuous crossed crustaceans degree developed difficulty distinct species divergence doubt effects eggs embryo existing exterminated extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs Origin of Species parent peculiar perfect pigeons pistil plants pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds slight South America stamens sterility structure struggle successive supposed swimbladder theory variability variations varieties vary whilst whole wings young