On the Origin of the Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for Life |
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Page 10
... birds , with the rarest ex- ceptions , hardly ever lay fertile eggs . Many exotic plants have pollen utterly worthless , in the same con- dition as in the most sterile hybrids . When , on the one hand , we see domesticated animals and ...
... birds , with the rarest ex- ceptions , hardly ever lay fertile eggs . Many exotic plants have pollen utterly worthless , in the same con- dition as in the most sterile hybrids . When , on the one hand , we see domesticated animals and ...
Page 23
... bird , is also remarkable from the wonderful deve- lopment of the carunculated skin about the head ; and this is ... birds the head and tail touch : the oil - gland is quite aborted . Several other less distinct breeds might be ...
... bird , is also remarkable from the wonderful deve- lopment of the carunculated skin about the head ; and this is ... birds the head and tail touch : the oil - gland is quite aborted . Several other less distinct breeds might be ...
Page 24
... birds are clothed when hatched . The shape and size of the eggs vary . The manner of flight , and in some breeds the voice and disposition , differ remark- ably . Lastly , in certain breeds , the males and females have come to differ in ...
... birds are clothed when hatched . The shape and size of the eggs vary . The manner of flight , and in some breeds the voice and disposition , differ remark- ably . Lastly , in certain breeds , the males and females have come to differ in ...
Page 25
... birds breeding on precipices , and good fliers , are unlikely to be exterminated ; and the common rock - pigeon , which has the same habits with the domestic breeds , has not been exterminated even on several of the smaller British ...
... birds breeding on precipices , and good fliers , are unlikely to be exterminated ; and the common rock - pigeon , which has the same habits with the domestic breeds , has not been exterminated even on several of the smaller British ...
Page 27
... birds be- longing to two or more distinct breeds are crossed , none of which are blue or have any of the above ... bird with a red tail and red spot on the forehead , and which noto- riously breeds very true ; the mongrels were dusky and ...
... birds be- longing to two or more distinct breeds are crossed , none of which are blue or have any of the above ... bird with a red tail and red spot on the forehead , and which noto- riously breeds very true ; the mongrels were dusky and ...
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Common terms and phrases
accumulated adapted affinities allied species America ancient appear Asa Gray become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt Edition eggs embryo existing exterminated extinct extremely facts favourable females fertilised fertility flowers formation forms fossil Fritz Müller Gärtner genera genus geological Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ less living males mammals manner migration modified descendants natural selection naturalists nearly nest occur oceanic islands offspring organisation parent perfect pigeons pistil pollen Post 8vo present principle probably produced progenitor racters ranked reciprocal crosses remarked resemble seeds sexual sexual selection Silurian slight South America stamens sterility structure struggle successive suppose theory tion variability variations varieties vary vols whole widely