Not done Sir, but doing.

"....the various races, when carefully compared and measured, differ much from each other-as in the texture of hair, the relative proportions of all parts of the body, the capacity of the lungs, the form and capacity of the skull, and even the convolutions of the brain. But it would be an endless task to specify the numerous points of difference. The races differ also in constitution, in acclimatization and in liability to certain diseases. Their mental characteristics are likewise very distinct; chiefly as it would appear in their emotion, but partly in their intellectual faculties. Everyone who has had the opportunity of comparison must have been struck by the contrast between taciturn, even morose aborigines of South America and the light-hearted, talkative negroes."