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The Descent of Man

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ody are affected in a closely analogous manner.<br />

This has been proved in such full detail by<br />

Godron and Quatrefages, that I need here only<br />

refer to their works. (14. Godron, 'De l'Espece,'<br />

1859, tom. ii. livre 3. Quatrefages, 'Unite de<br />

l'Espece Humaine,' 1861. Also Lectures on Anthropology,<br />

given in the 'Revue des Cours Scientifiques,'<br />

1866-1868.) Monstrosities, which<br />

graduate into slight variations, are likewise so<br />

similar in man and the lower animals, that the<br />

same classification and the same terms can be<br />

used for both, as has been shewn by Isidore<br />

Ge<strong>of</strong>froy St.-Hilaire. (15. 'Hist. Gen. et Part. des<br />

Anomalies de l'Organisation,' in three volumes,<br />

tom. i. 1832.) In my work on the variation <strong>of</strong><br />

domestic animals, I have attempted to arrange<br />

in a rude fashion the laws <strong>of</strong> variation under<br />

the following heads:—<strong>The</strong> direct and definite<br />

action <strong>of</strong> changed conditions, as exhibited by<br />

all or nearly all the individuals <strong>of</strong> the same species,<br />

varying in the same manner under the<br />

same circumstances. <strong>The</strong> effects <strong>of</strong> the long-

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