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 ix
... land , and by occasional means Dispersal during the Glacial period - Alternate Glacial periods in the north and south l'age 422-461 CHAPTER XII . GEOGRAPHICAL DISTRIBUTION - continued . ---- Distribution of fresh - water productions ...
... land , and by occasional means Dispersal during the Glacial period - Alternate Glacial periods in the north and south l'age 422-461 CHAPTER XII . GEOGRAPHICAL DISTRIBUTION - continued . ---- Distribution of fresh - water productions ...
Page 32
... land or mountain pasture , with the wool of one breed good for one purpose , and that of another breed for another purpose ; when we compare the many breeds of dogs , each good for man in very different ways ; when we compare the game ...
... land or mountain pasture , with the wool of one breed good for one purpose , and that of another breed for another purpose ; when we compare the many breeds of dogs , each good for man in very different ways ; when we compare the game ...
Page 56
... varieties in Mr. Wollaston's admirable work , but which would certainly be ranked as distinct species by many entomologists . Even Ire- land has a few animals , now generally regarded as 56 CHAP . II . DOUBTFUL SPECIES .
... varieties in Mr. Wollaston's admirable work , but which would certainly be ranked as distinct species by many entomologists . Even Ire- land has a few animals , now generally regarded as 56 CHAP . II . DOUBTFUL SPECIES .
Page 57
Or, The Preservation of Favoured Races in the Struggle for Life Charles Darwin. land has a few animals , now generally regarded as varieties , but which have been ranked as species by some zoologists . Several experienced ornithologists ...
Or, The Preservation of Favoured Races in the Struggle for Life Charles Darwin. land has a few animals , now generally regarded as varieties , but which have been ranked as species by some zoologists . Several experienced ornithologists ...
Page 62
... land - shells in Madeira , and with plants by Gaston de Saporta . If a variety were to flourish so as to exceed in numbers the parent species , it would then rank as the species , and the species as the variety ; or it might come to ...
... land - shells in Madeira , and with plants by Gaston de Saporta . If a variety were to flourish so as to exceed in numbers the parent species , it would then rank as the species , and the species as the variety ; or it might come to ...
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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