No doubt the average European shows some advantage in this respect as compared, say, with the Bushman.
But then you have to write off so much for their respective types of body, a bigger body going in general with a bigger head, that in the end you find yourself comparing mere abstractions.

Again, the European may be the first to cry off on the ground that comparisons are odious; for some specimens of Neanderthal man in sheer size of the brain cavity are said to give points to any of our modern poets and politicians.
Clearly, then, something is wrong with this test.

Nor, if the brain itself be examined after death, and the form and number of its convolutions compared, is this criterion of hereditary brain-power any more satisfactory.

It might be possible in this way to detect the difference between an idiot and a person of normal intelligence, but not the difference between a fool and a genius.
We cross the uncertain line that divides the bodily from the mental when we subject the same problem of hereditary mental endowment to the methods of what is known as experimental psychology.

Thus acuteness of sight, hearing, taste, smell and feeling are measured by various ingenious devices.