The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for Life, 2±ÇD. Appleton, 1896 |
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... individual - EMBRYOLOGY , laws of , explained by variations not supervening at any early age , and being inherited at a corresponding age - RUDIMENTARY ORGANS ; their origin ex- plained - Summary .. ...... .. Page 202 CHAPTER XV ...
... individual - EMBRYOLOGY , laws of , explained by variations not supervening at any early age , and being inherited at a corresponding age - RUDIMENTARY ORGANS ; their origin ex- plained - Summary .. ...... .. Page 202 CHAPTER XV ...
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... individual or variety increases the vigour and fertility of the offspring , and on the other hand that very close interbreeding lessens their vigour and fertility , that I cannot doubt the correctness of this conclusion . Hybrids are ...
... individual or variety increases the vigour and fertility of the offspring , and on the other hand that very close interbreeding lessens their vigour and fertility , that I cannot doubt the correctness of this conclusion . Hybrids are ...
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... or even more than commonly perfect fertility , in a first cross between two distinct species . This case of the Crinum leads me to refer to a singular fact , namely , that individual plants of certain 6 [ CHAP . IX . HYBRIDISM .
... or even more than commonly perfect fertility , in a first cross between two distinct species . This case of the Crinum leads me to refer to a singular fact , namely , that individual plants of certain 6 [ CHAP . IX . HYBRIDISM .
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... individuals , and in other species all the individuals , can actually be hybridised much more readily than they can be fertilised by pollen from the same individual plant ! To give one instance , a bulb of Hippeastrum aulicum produced ...
... individuals , and in other species all the individuals , can actually be hybridised much more readily than they can be fertilised by pollen from the same individual plant ! To give one instance , a bulb of Hippeastrum aulicum produced ...
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... individuals are allowed to cross freely with each other , and the injurious influence of close interbreeding is thus prevented . Any one may readily convince himself of the efficiency of insect- agency by examining the flowers of the ...
... individuals are allowed to cross freely with each other , and the injurious influence of close interbreeding is thus prevented . Any one may readily convince himself of the efficiency of insect- agency by examining the flowers of the ...
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