PSYCHOLOGY OF MENTAL DEFICIENCY 



93 



Figs. 13 and 14. Precision Tests in Motor Control. The girl in the picture 

 i? 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 pre- 

 vent marriage. Other means may in extreme cases be justifiable; some- 

 times sterilization is found advisable, but popular opinion usually rebels 

 against such measures. 



