Darwinism Stated by Darwin Himself: Characteristic Passages from the Writings of Charles DarwinD. Appleton, 1884 - Всего страниц: 351 |
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Стр. 18
... labellum , formed of one petal and two petaloid stamens ; with its singular pollen- masses , hereafter to be referred to ; with its column formed of seven cohering organs , of which three alone perform their proper function , namely ...
... labellum , formed of one petal and two petaloid stamens ; with its singular pollen- masses , hereafter to be referred to ; with its column formed of seven cohering organs , of which three alone perform their proper function , namely ...
Стр. 20
... labellum of many Vandeæ is gnawed by insects , and thus attracts them ; but in Mormodes ignea it is greatly reduced in size , and serves in chief part to keep the labellum in its new position on the summit of the column . From the ...
... labellum of many Vandeæ is gnawed by insects , and thus attracts them ; but in Mormodes ignea it is greatly reduced in size , and serves in chief part to keep the labellum in its new position on the summit of the column . From the ...
Стр. 21
... labellum to assume the position of a lower petal , so that insects can easily visit the flower ; but from slow changes in the form or position of the petals , or from new sorts of in- sects visiting the flowers , it might be ...
... labellum to assume the position of a lower petal , so that insects can easily visit the flower ; but from slow changes in the form or position of the petals , or from new sorts of in- sects visiting the flowers , it might be ...
Стр. 22
... labellum has ac- quired its present upward position by the ovarium being twisted twice as much as is usual . Again , we have seen that in most Vandea there is a plain relation between the depth of the stigmatic chamber and the length of ...
... labellum has ac- quired its present upward position by the ovarium being twisted twice as much as is usual . Again , we have seen that in most Vandea there is a plain relation between the depth of the stigmatic chamber and the length of ...
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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