Passing to later ages, we cannot expect to learn much about the speech of prehistoric men, whom we know only by a few bones. As to the Java skull, Dr. Keith observes that “the region of the brain which subserves the essentially human gift of speech, was not ape-like in Pithecanthropus. The parts for speech are there; they are small, but clearly foreshadow the arrangement of convolutions seen in modern man.” On the other hand, “the higher association areas ... had not reached a human level.”[59] The jaw of this skull not having been found, nothing can be said of its fitness for carrying out the process of articulation. As to Eoanthropus, “if our present conception of the orbital part of the third frontal convolution is well founded, namely, that it takes part in the mechanism of speech, then we have grounds for believing that the Piltdown man had reached that point of brain-development when speech had become a possibility. When one looks at the lower jaw, however, and the projecting canine teeth, one hesitates to allow him more than a potential ability.”[60] The jaw had not undergone the characteristic changes which in modern man give freedom to the tongue in the articulation of words.[61] But Dr. Keith “cannot detect any feature in the frontal, parietal or occipital areas which clearly separate this brain-cast from modern ones.”[62] Eoanthropus, therefore, must have had a good deal to say and, being a social animal, must have felt the need of expression; and, though he was not a direct ancestor of ours, it can hardly be doubted that at some period the jaws of our own ancestors were no better adapted than his to articulate speech. May we not infer that articulate speech, meeting a need of the stock, arose very gradually, and was slowly differentiated from some less definite and structural connection of expressive and onomatopœic vocables, such as we have seen may naturally have arisen amongst the earliest hunters? _Pari passu_ the jaw was modified.