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 through their relationship with hand and brain.

The reason why some persons are left-handed and fewer ambidexterous is not essential to the present discussion. It is sufficient to note that the speech-centers of the left-handed are situated in the right brain. The relationship between the hand and the mechanism of speech in the brain is conclusively established by the fact that the hand most used determines by force of habit to what part of the brain words must go for registration, and from what part they must come on their mission from mind to mind.

From known facts it is reasonable to assume that the ambidexterous person has speech-centers developed in both hemispheres of the brain. I am not aware that clinical experience has shown this to be true; but that it is true of the perfectly ambidexterous, there can be little doubt. If it is true, it presents an educational problem of importance to infancy and youth. For, by developing the speech