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The exactitude of a simple arm movement seems to increase in the first ten seconds, then rapidly to decrease. The emotional attitude, too, is of importance for the reproduction of a movement. I trained myself in making definite extensor and flexor movements of the arm until I was able to reproduce them under normal conditions with great exactitude.
In the scratch reflex, for instance, the impulse which excites the flexor muscles inhibits the excitation of the extensor muscles. I believe this principle underlies the higher processes and upon it is built up the whole of the psycho-physiological mechanisms. DR. TOM A. WILLIAMS, Washington, D. C.: I want Dr. Putnam to reply to two objections to his position.
"As to the muscles, there is a short flexor, a short extensor, and a peronaeus longus, while the tendons of the long flexors of the great toe and of the other toes are united together and into an accessory fleshy bundle. "The hind-limb of the Gorilla, therefore, ends in a true foot with a very movable great toe.
The active use of the too elongated muscles will produce extension in those that are too much shortened. By doing this we bring about certain normal conditions and relations of parts. Again we find that the stretch is activity of the extensor muscles. It is the action of the extensor muscles upon which health especially depends.
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