Before passing on, however, let this one word to the wise be uttered.

If the skull can be so affected, then what about the brain inside it?
If the hereditarily long-headed can change under suitable conditions, then what about the hereditarily short-witted?
It remains to say a word about the types of pre-historic men as judged by their bony remains and especially by their skulls.

Naturally the subject bristles with uncertainties.
By itself stands the so-called Pithecanthropus (Ape-man) of Java, a regular "missing link." The top of the skull, several teeth, and a thigh-bone, found at a certain distance from each other, are all that we have of it or him.

Dr.Dubois, their discoverer, has made out a fairly strong case for supposing that the geological stratum in which the remains occurred is Pliocene--that is to say, belongs to the Tertiary epoch, to which man has not yet been traced back with any strong probability.

It must remain, however, highly doubtful whether this is a proto-human being, or merely an ape of a type related to the gibbon.