On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeD. Appleton, 1909 - 430페이지 |
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8 페이지
... developed in an unusual manner are highly variable : specific characters more variable than generic : secondary sexual characters variable - Species of the same genus vary in an analogous manner - Reversions to long - lost characters ...
... developed in an unusual manner are highly variable : specific characters more variable than generic : secondary sexual characters variable - Species of the same genus vary in an analogous manner - Reversions to long - lost characters ...
16 페이지
... developed being or elaborately constructed organ ; secondly , the subject of Instinct , or the mental powers of animals ; thirdly , Hybridism , or the infertility of species and the fertility of varieties when intercrossed ; and ...
... developed being or elaborately constructed organ ; secondly , the subject of Instinct , or the mental powers of animals ; thirdly , Hybridism , or the infertility of species and the fertility of varieties when intercrossed ; and ...
30 페이지
... developed crop , which it glories in inflating , may well excite astonish- ment and even laughter . The turbit has a very short and conical beak , with a line of reversed feathers down the breast ; and it has the habit of continually ex ...
... developed crop , which it glories in inflating , may well excite astonish- ment and even laughter . The turbit has a very short and conical beak , with a line of reversed feathers down the breast ; and it has the habit of continually ex ...
31 페이지
... develop- ment of the bones of the face in length and breadth and curvature differs enormously . The shape , as well as the breadth and length of the ramus of the lower jaw , varies in a highly remarkable manner . The caudal and sacral ...
... develop- ment of the bones of the face in length and breadth and curvature differs enormously . The shape , as well as the breadth and length of the ramus of the lower jaw , varies in a highly remarkable manner . The caudal and sacral ...
33 페이지
... developed . More- over , when birds belonging to two ог more distinct breeds are crossed , none of which are blue or have any of the above - specified marks , the mongrel offspring are very apt suddenly to acquire these characters . To ...
... developed . More- over , when birds belonging to two ог more distinct breeds are crossed , none of which are blue or have any of the above - specified marks , the mongrel offspring are very apt suddenly to acquire these characters . To ...
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accumulated adapted affinities allied species America analogous ancient animals appear archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo endemic existing exterminated extinct extremely facts favourable fertilised fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ laws less living males mammals manner migration modification modified descendants natural selection naturalists nearly nest occasionally offspring organic organisation origin of species perfect pigeons plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary seeds sexual sexual selection Silurian slight sometimes South America sterility structure struggle successive supposed swimbladder tend theory variability variations varieties vary whole widely