Darwinism Stated by Darwin Himself: Characteristic Passages from the Writings of Charles DarwinD. Appleton, 1884 - Всего страниц: 351 |
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Стр. 5
... highly sensitive to the slightest con- tinued pressure , and another highly sensitive to a slight momentary touch . The habit of moving at certain pe- riods is inherited both by plants and animals ; and several other points of ...
... highly sensitive to the slightest con- tinued pressure , and another highly sensitive to a slight momentary touch . The habit of moving at certain pe- riods is inherited both by plants and animals ; and several other points of ...
Стр. 8
... highly beneficial ; but how could their sexual elements have been differen- tiated by exposure to different conditions ? If the progeni- tors of the two plants had lived on the same spot during the last score of generations , and had ...
... highly beneficial ; but how could their sexual elements have been differen- tiated by exposure to different conditions ? If the progeni- tors of the two plants had lived on the same spot during the last score of generations , and had ...
Стр. 9
... highly fertile . Seedlings from a cross of this kind grow with great vigor , and trans- mit their vigor to their descendants . These , therefore , in the struggle for life , will generally beat and exterminate the seedlings from plants ...
... highly fertile . Seedlings from a cross of this kind grow with great vigor , and trans- mit their vigor to their descendants . These , therefore , in the struggle for life , will generally beat and exterminate the seedlings from plants ...
Стр. 12
... highly ser- viceable as a means of dissemination , but we now know that fertile eggs can be produced without the aid of the male . There are also many other methods by which organisms can be propagated asexually . Why then have the two ...
... highly ser- viceable as a means of dissemination , but we now know that fertile eggs can be produced without the aid of the male . There are also many other methods by which organisms can be propagated asexually . Why then have the two ...
Стр. 14
... highly complex organization ; and that at the same time there was no need for all the individuals to produce young , and conse- quently that no injury , on the contrary , good 14 DARWINISM STATED BY DARWIN HIMSELF . Why the Sexes have ...
... highly complex organization ; and that at the same time there was no need for all the individuals to produce young , and conse- quently that no injury , on the contrary , good 14 DARWINISM STATED BY DARWIN HIMSELF . Why the Sexes have ...
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acquired action admit allied apes appear Asa Gray become believe birds blush body breeds Catarrhine cause characters closely Cloth Darwin degree descended developed distinct species domestic doubt early effects eggs existence expression extinct eyes fact favorable feel females fertilization forms gemmules genera geotropism habit hair HERBERT SPENCER hermaphrodites highly horse Illustrations increase individuals inhabitants inherited insects instance intermediate islands kind labellum lancelet language larvæ less living lower animals males mammals manner ment mental mind modified monkeys movements muscles natural selection naturalists observed offspring organic Origin of Species papillæ parent peculiar period plants pollen possess present principle probably produced Professor progenitors Quadrumana quadrupeds races remarkable resemble rudimentary savages seeds seems seen sexes sexual selection slight South America structure suppose T. H. HUXLEY tend tendency tion transmitted utricle variability variations varieties various vertebræ whole wild worms young