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Let us illustrate my views on the value of specific characters by an example. The Negro differs from the white man in having woolly and crisped hair, a black skin, projecting lower jaw, thick lips, a flat nose ^[[insertion]] bowed shins [[/insertion]] a projecting heel. But individual white men occur with  
{each of these peculiar characters:
{ pigment cells under epidermis?
they are [[strikethrough]] not [[/strikethrough]] none of them, therefore, perfectly constant characters, & if we knew nothing of the perfect facility with which the negro intercrosses with the white man, and the perfect fruitfulness of the offspring of such intercrosses, we might safely conclude that the negro is not a distinct species, but a mere variety of [[strikethrough]] the human [[/strikethrough]] Homo sapiens. [species of Cecidomyia]