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 54
... Gärtner , they can be crossed only with much difficulty . We could hardly wish for better evidence of the two forms being specifically distinct . On the other hand , they are united by many intermediate links , and it is very doubtful ...
... Gärtner , they can be crossed only with much difficulty . We could hardly wish for better evidence of the two forms being specifically distinct . On the other hand , they are united by many intermediate links , and it is very doubtful ...
Page 93
... Gärtner , any influence from the foreign pollen . When the stamens of a flower suddenly spring towards the pistil , or slowly move one after the other towards it , the contrivance seems adapted solely to ensure self- fertilisation ; and ...
... Gärtner , any influence from the foreign pollen . When the stamens of a flower suddenly spring towards the pistil , or slowly move one after the other towards it , the contrivance seems adapted solely to ensure self- fertilisation ; and ...
Page 220
... Gärtner , also , makes the rule equally universal ; and he disputes the entire fertility of Kölreuter's ten cases . But in these and in many other cases , Gärtner is obliged carefully to count the seeds , in order to show that there is ...
... Gärtner , also , makes the rule equally universal ; and he disputes the entire fertility of Kölreuter's ten cases . But in these and in many other cases , Gärtner is obliged carefully to count the seeds , in order to show that there is ...
Page 221
... Gärtner during several years repeatedly crossed the primrose and cowslip , which we have such good reason to believe to be varieties , and only once or twice succeeded in getting fertile seed ; as he found the common red and blue ...
... Gärtner during several years repeatedly crossed the primrose and cowslip , which we have such good reason to believe to be varieties , and only once or twice succeeded in getting fertile seed ; as he found the common red and blue ...
Page 222
... Gärtner , namely , that if even the less fertile hybrids be artificially fertilised with hybrid pollen of the same kind , their fertility , notwithstanding the frequent ill effects of manipulation , sometimes decidedly increases , and ...
... Gärtner , namely , that if even the less fertile hybrids be artificially fertilised with hybrid pollen of the same kind , their fertility , notwithstanding the frequent ill effects of manipulation , sometimes decidedly increases , and ...
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Common terms and phrases
accumulated adapted affinities allied species America analogous ancient animals appear archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo endemic existing exterminated extinct extremely facts favourable fertilised fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ laws less living males mammals manner migration modification modified descendants natural selection naturalists nearly nest occasionally offspring organic organisation origin of species perfect pigeons plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary seeds sexual sexual selection Silurian slight sometimes South America sterility structure struggle successive supposed swimbladder tend theory variability variations varieties vary whole widely