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 physiological intimacy began between hand and speech-center.

The area in the brain which controls the movements of the hand is closely associated with the area that governs the muscular movements of face, lips, and tongue. That there is a relationship between gesture and grimace may be readily demonstrated. Facial expression is known to be closely related to movements of lips and tongue. From gesture to grimace; from facial expression to guttural, lingual, and labial sound is only a step when largely considered. Of course the mind dominated gesture, grimace, and vocal sound; for without the human mind the sounds, and all the rest, must have remained like those of the ape—they never could have developed into human language.

Right-handed man naturally used his right-hand more than his left in his early sign-speech. As the will sought to assist the hand by forcing other organs to take part in speech, it adopted what one might well call a com-