The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for Life |
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Page x
... fertile hybrid moths . The discussion on the fertility of hybrids not having been acquired through natural selection condensed and modified . Fifth Sixth Edition . Edition . Chief Additions and Corrections X ADDITIONS AND CORRECTIONS .
... fertile hybrid moths . The discussion on the fertility of hybrids not having been acquired through natural selection condensed and modified . Fifth Sixth Edition . Edition . Chief Additions and Corrections X ADDITIONS AND CORRECTIONS .
Page 5
... fertility of varieties when intercrossed ; and fourthly , the imperfec- tion of the Geological Record . In the next chapter I shall consider the geological succession of organic beings throughout time ; in the twelfth and thirteenth ...
... fertility of varieties when intercrossed ; and fourthly , the imperfec- tion of the Geological Record . In the next chapter I shall consider the geological succession of organic beings throughout time ; in the twelfth and thirteenth ...
Page 11
... 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 plants , though often weak and sickly , breeding freely ...
... 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 plants , though often weak and sickly , breeding freely ...
Page 18
... fertility of varieties when crossed , -a subject hereafter to be discussed ) , domestic races of the same species differ from each other in the same manner as do the closely- allied species of the same genus in a state of nature , but ...
... fertility of varieties when crossed , -a subject hereafter to be discussed ) , domestic races of the same species differ from each other in the same manner as do the closely- allied species of the same genus in a state of nature , but ...
Page 30
... fertile , as I can state from my own observations , purposely made , on the most distinct breeds . Now , hardly any cases have been ascertained with certainty of hybrids from two quite distinct species of animals being perfectly fertile ...
... fertile , as I can state from my own observations , purposely made , on the most distinct breeds . Now , hardly any cases have been ascertained with certainty of hybrids from two quite distinct species of animals being perfectly fertile ...
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Common terms and phrases
adapted affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellę larvę less living males mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion trees variability variations varieties vary whilst whole wings young