Page:Popular Science Monthly Volume 41.djvu/655

 it. In either way we have an extremely simple means of obtaining records of involuntary movements, which any one interested



, Upper line, movements of head; lower line, of hand on automatograph; time, 45 seconds. The head movements are reversed, but have been again reversed for readier comparison. Figs. 2 to 11 are all obtained upon the same subject. The arrows indicate the direction in which the object attended to was situated.

may construct and test for himself. The use of such a device is not confined to the hand; the plate or the rod may be fixed to other portions of the body.

Having shown that the hand moves toward the direction of

 Facing Automatograph, sitting. I, ; time, 105 seconds. II, ; time, 45 seconds.

one's thoughts, the next important step is to determine whether this movement is altogether the expression of the subject's mental activity, and, if not, what other factors contribute to it; and, further, in what part or parts of the body it originates, what are its components, and the like. These movements have a close connection with the body as well as with the