Page:Popular Science Monthly Volume 79.djvu/97

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PSYCHOLOGY OF MENTAL DEFICIENCY
PSM V79 D097 Precision tests in motor control.png

Figs. 13 and 14. Precision Tests in Motor Control. The girl in the picture is a high-grade imbecile and is able to thread this large needle and touch the copper points with the stylus. A child of slightly lower grade could do neither.

the advancement of our present-day civilization and educational progress. As cure is impossible, the two chief sources of prevention suggested are to keep such people segregated in institutions and to prevent marriage. Other means may in extreme cases be justifiable; sometimes sterilization is found advisable, but popular opinion usually rebels against such measures.