It may not be compatible with perfectly easy erect locomotion; but, then, how can we conceive that early man, _as an animal_, gained anything by purely erect locomotion?
Again, the hand of man contains latent capacities and powers which are unused by savages, and must have been even less used by palaeolithic man and his still ruder predecessors.

It has all the appearance of an organ prepared for the use of civilized man, and one which was required to render civilization possible." Again speaking of the "wonderful power, range, flexibility, and sweetness of the musical sounds producible by the human larynx," he adds, "The habits of savages give no indication of how this faculty could have been developed by Natural Selection; because it is never required or used by them.

The singing of savages is a more or less monotonous howling, and the females seldom sing at all.

Savages certainly never choose their wives for fine voices, but for rude health, and strength and physical beauty.

Sexual selection could not therefore have developed this wonderful power, which only comes into play among civilized people.