Note 316 — Chapter XVI

Here I will ask the reader to bear in mind the considerations above adduced from Geiger, as to the encouragement which must have been given to a semiotic use of vocal sounds by habitual attention being given to the movements of the mouth in significant grimace—such attention being naturally bestowed in larger measure by an intelligent ape-like creature which was accustomed to depend chiefly on its sense of sight, than it would be by any of the existing quadrumana.