On the Origin of Species by Means of Natural Selection: Or the Preservation of Favoured Races in the Struggle for Life |
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Page 85
... distinct variety having a prepotent effect over a flower's own pollen ; and that this is part of the general law of good being derived from the intercrossing of distinct individuals of the same species . When distinct species are ...
... distinct variety having a prepotent effect over a flower's own pollen ; and that this is part of the general law of good being derived from the intercrossing of distinct individuals of the same species . When distinct species are ...
Page 99
... distinct genera of grasses , a greater number of plants and a greater weight of dry herbage can thus be raised . The same has been found to hold good when first one variety and then several mixed varieties of wheat have been sown on ...
... distinct genera of grasses , a greater number of plants and a greater weight of dry herbage can thus be raised . The same has been found to hold good when first one variety and then several mixed varieties of wheat have been sown on ...
Page 214
... distinct flower , either from the same plant or from another plant of the same hybrid nature . And thus , the strange fact of the increase of fertility in the successive generations of artificially fertilized hybrids may , I believe ...
... distinct flower , either from the same plant or from another plant of the same hybrid nature . And thus , the strange fact of the increase of fertility in the successive generations of artificially fertilized hybrids may , I believe ...
Contents
INTRODUCTION | 1 |
STRUGGLE FOR EXISTENCE | 52 |
NATURAL SELECTION | 69 |
Copyright | |
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Common terms and phrases
accumulated adapted affinities allied species amount analogous ancient appear archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common parent continuous crossed crustaceans degree difficulty distant distinct species divergence doubt embryo Europe existing exterminated extinct extremely facts favourable fertility flowers formation forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important increase in number individuals inhabitants inherited insects instance instincts intercrossing land larvæ less living male mammals manner migration modification modified descendants natural selection naturalists nearly nest occasional oceanic islands offspring Origin of Species perfect pigeons plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemblance seeds sexual selection Silurian slight sometimes South America sterility structure struggle successive supposed swimbladder tend theory tion trees variability variation vary whole widely