HISTORIC GROWTH OF MAN.
FERRIER S EXPERIMENTS. 155
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the principal part of the organs located in this way. It was a misconception on the part of some scientists to name these "motor centers." Ferrier says that the movements were evidently made to express feelings; they were true gestures. Our drawing shows the external surface of the brain, the folding or convolutions. Ferrier only marks what parts of the body were responsively excited by each region of the brain. We have added the name of the mental faculty belonging there.
The current from an organ of the brain goes over a long and curved path in order to reach a muscle. How, then, does it move the latter in its own line of direction? It can only be by inducing its own state cf polarity in the muscular fibers. Thus polarized they at once assume the same direction as the brain-faculty. This is the only explanation science can now offer concerning these responsive actions.
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LINES OF GESTURE.
