On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for Life |
From inside the book
Results 6-10 of 66
Page 43
... flower and kitchen gardens . If it has taken centuries or thousands of years to improve or modify most of our plants up to their present standard of usefulness to man , we can understand how it is that neither Australia , the Cape of ...
... flower and kitchen gardens . If it has taken centuries or thousands of years to improve or modify most of our plants up to their present standard of usefulness to man , we can understand how it is that neither Australia , the Cape of ...
Page 50
... flowers of a widely different structure ; and if the plant ceased to produce flowers of the one kind , a great change might perhaps suddenly be effected in the specific character ; but then we do not at present know by what steps , or ...
... flowers of a widely different structure ; and if the plant ceased to produce flowers of the one kind , a great change might perhaps suddenly be effected in the specific character ; but then we do not at present know by what steps , or ...
Page 54
... flower at slightly different periods ; they grow in somewhat different stations ; they ascend mountains to different heights ; they have different geographical ranges ; and lastly , according to very numerous experiments made during ...
... flower at slightly different periods ; they grow in somewhat different stations ; they ascend mountains to different heights ; they have different geographical ranges ; and lastly , according to very numerous experiments made during ...
Page 73
... flower . I have also found that the visits of bees are necessary for the fertilisation of some kinds of clover : for instance , 20 heads of Dutch clover ( Trifolium repens ) yielded 2,290 seeds ; but 20 other heads protected from bees ...
... flower . I have also found that the visits of bees are necessary for the fertilisation of some kinds of clover : for instance , 20 heads of Dutch clover ( Trifolium repens ) yielded 2,290 seeds ; but 20 other heads protected from bees ...
Page 74
... flowers in that district ! ] In the case of every species , many different checks , acting at different periods of life , and during different seasons or years , probably come into play ; some one check or some few being generally the ...
... flowers in that district ! ] In the case of every species , many different checks , acting at different periods of life , and during different seasons or years , probably come into play ; some one check or some few being generally the ...
Other editions - View all
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