The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life and The Descent of Man and Selection in Relation to Sex |
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adapted admit affinities America ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely fact favourable female fertilised fertility fishes flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less likewise living male mammæ mammals manner Marsupials migration Mivart modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent perfect pistil plants pollen present principle probably produced quadrupeds races remarks resemblance rudimentary seeds sexual selection slight South America stamens sterility structure successive supposed tend theory tion variable variations varieties vary whilst whole widely young