sound logic, that the development of man has been more marked in his mental organization than in his external form. Man, he conceives to differ from the animal, by being able to undergo great changes of conditions and of his entire environment, without very marked alterations in bodily form and structure. The changes of climate he meets with a corresponding alteration in his clothing, shelter, weapons, and implements of husbandry. His body may become less hairy, more erect, and of a different color and proportions; "the head and face is immediately connected with the organ of the mind, and as being the medium, expressing the most refined motions of his nature," alone change with the development of his intellect. There was a time when "he had not yetacquired that wonderfully-developed brain, the organ of the mind, which now, even in his lowest examples, raises him far above the highest brutes, at a period when he had the form, but hardly the nature of man, when he neither possessed human speech nor sympathetic and moral feelings." Further, Mr. Wallace says that "Man may have been--indeed, I believe must have been, once a homogeneous

race . . . in man, the hairy covering of the body has almost entirely disappeared." Of the cave men of Les Eyzies, Mr. Wallace remarks further " . . . the great breadth of the face, the enormous development of the ascending ramus of the lower jaw . . . indicate enormous muscular power and the habits of a savage and brutal race."

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