On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeHeritage Press, 1963 - 470페이지 |
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xix 페이지
... analogous conclusions . From a circular lately issued it appears that Dr. Freke , in 1851 ( “ Dublin Medical Press , ' p . 322 ) , propounded the doctrine that all organic beings have descended from one primordial form . His grounds of ...
... analogous conclusions . From a circular lately issued it appears that Dr. Freke , in 1851 ( “ Dublin Medical Press , ' p . 322 ) , propounded the doctrine that all organic beings have descended from one primordial form . His grounds of ...
126 페이지
... analogous domestic races . The most distinct breeds of the pigeon , in countries variations , so that a variety of one species widely apart , present sub - varieties with reversed feathers on the head , , often assumes a and with ...
... analogous domestic races . The most distinct breeds of the pigeon , in countries variations , so that a variety of one species widely apart , present sub - varieties with reversed feathers on the head , , often assumes a and with ...
128 페이지
... analogous manner ; so that the varieties of two or more species would resemble each other , or that a variety of one species would resemble in certain characters another and distinct species , —this other species being , according to ...
... analogous manner ; so that the varieties of two or more species would resemble each other , or that a variety of one species would resemble in certain characters another and distinct species , —this other species being , according to ...
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accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters cirripedes climate closely allied colour common progenitor continuous crossed crustaceans degree developed difficulty distinct species divergence doubt effects eggs embryo existing exterminated extinct extremely fact favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period gradations greater number 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 parent peculiar perfect pigeons pistil plants pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection slight South America stamens sterility structure successive supposed swimbladder theory variability variations varieties vary whilst whole widely different wings young