On the Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for Life1859 |
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Page vii
... insects - Summary 207-244 CHAPTER VIII . HYBRIDISM . Distinction between the sterility of first crosses and of hybrids Sterility various in degree , not universal , affected by close inter- breeding , removed by domestication - Laws ...
... insects - Summary 207-244 CHAPTER VIII . HYBRIDISM . Distinction between the sterility of first crosses and of hybrids Sterility various in degree , not universal , affected by close inter- breeding , removed by domestication - Laws ...
Page 3
... insects under the bark of trees . In the case of the misseltoe , which draws its nourishment from certain trees , which has seeds that must be transported by certain birds , and which has flowers with separate sexes absolutely requiring ...
... insects under the bark of trees . In the case of the misseltoe , which draws its nourishment from certain trees , which has seeds that must be transported by certain birds , and which has flowers with separate sexes absolutely requiring ...
Page 45
... insect would have been variable in the same species ; I should have expected that changes of this nature could have been effected only by slow degrees : yet quite recently Mr. Lubbock has CHAP . II . 45 VARIATION UNDER NATURE .
... insect would have been variable in the same species ; I should have expected that changes of this nature could have been effected only by slow degrees : yet quite recently Mr. Lubbock has CHAP . II . 45 VARIATION UNDER NATURE .
Page 46
... insects are very far from uniform . Authors sometimes argue in a circle when they state that important organs never vary ; for these same authors practically rank that cha- racter as important ( as some few naturalists have honestly ...
... insects are very far from uniform . Authors sometimes argue in a circle when they state that important organs never vary ; for these same authors practically rank that cha- racter as important ( as some few naturalists have honestly ...
Page 48
... insects in North America and Europe , which differ very slightly from each other , have been ranked by one eminent naturalist as undoubted species , and by another as varieties , or , as they are often called , as geographical races ...
... insects in North America and Europe , which differ very slightly from each other , have been ranked by one eminent naturalist as undoubted species , and by another as varieties , or , as they are often called , as geographical races ...
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Common terms and phrases
adapted affinities allied species America amount analogous ancient animals become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common parent continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo Europe existing exterminated extinct extremely facts favourable Fcap fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites History hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate land larvæ less living male mammals manner migration modification modified descendants natural selection naturalists nearly nest offspring perfect pigeons plants pollen Post 8vo present principle probably produced progenitor racters ranked reciprocal crosses remarked resemble Second Edition seeds sexual selection Silurian slight South America sterility structure struggle successive suppose theory Third Edition tion variability variation varieties vary Vols whole widely Woodcuts