Not by Sexual Selection, for there is not the slightest evidence that nudity was ever popular in apedom.

We have undoubted evidence, in the two bone needles found with the bones of the man of Mentone, that the primeval men were naked, and complete proof that Natural Selection could not effect such a disadvantageous change had they been hairy.
Here, then, we have an _inferiority_ to other animals in the animal structure, strangely at variance with the general superiority, and only to be accounted for as an educational provision.
But chiefly in the human head does the great outward distinction appear.
The brain is the great instrument with which the mind works.

You can gauge the strength of Ulysses by his bow, and the bulk of the giant by the staff of his spear, which was like a weaver's beam.

The brain of the largest ape is about thirty two cubic inches.

The brains of the wildest Australians are more than double that capacity.