On the Origin of SpeciesHarvard University Press, 2003 - Всего страниц: 553 It is now generally recognized that the publication of Darwin's Origin of Species in 1859 not only decisively altered the basic concepts of biological theory but had a profound and lasting influence on social, philosophic, and religious thought. This work is rightly regarded as one of the most important books ever printed. |
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Charles Darwin. CHAPTER VI . DIFFICULTIES ON THEORY . Difficulties on the theory of descent with modification ... difficulty- Natura non facit saltum - Organs of small importance - Organs not in all cases absolutely perfect - The ...
... difficulty , which at first appeared to me insuperable , and actually fatal to my whole theory . I allude to the neuters or sterile females in insect - communities : for these neuters often differ widely in instinct and in structure ...
... difficulty of either grafting or crossing together various species has been a special endow- ment ; although in the case of crossing , the difficulty is as important for the endurance and stability of spe- cific forms , as in the case ...
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VARIATION UNDER DOMESTICATION | 7 |
VARIATION UNDER NATURE | 44 |
STRUGGLE FOR EXISTENCE | 60 |
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Publications of the Biological Services Program Biological Services Program (U.S.) Полный просмотр - 1978 |
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An Introduction to Behavioural Ecology Nicholas B. Davies,John R. Krebs Недоступно для просмотра - 1993 |