VARIATIONS IN BRAIN-WEIGHT. 



135 



TABLE 29. SHOWING THE WEIGHT OF THE ENCEPHALON AND 

 ITS SUBDIVISIONS IN INSANE PERSONS, THE RECORDS 

 BEING ARRANGED ACCORDING TO SEX, AGE, AND STATURE. 

 (Froui Marshall's tables based on Boyd's records^) 



a indicates that a record considered according to age is too 

 large ; s indicates that a record considered according to stature is 

 too large. 



When these figures are compared with those for the 

 sane, in Table 13, it appears that in the insane males the 

 encephala in two groups are heavier than in the sane. 

 The mean weight for the insane males, however, is 

 slightly less than for the sane (15 grammes). When the 

 females are compared in the same way, it is found that 

 in the insane five groups show the encephalon heavier 

 than in the sane, and the mean weight in both classes is 

 the same. Since in the insane the wasting forms of 

 mental disease are proportionally much more numerous 

 among the males than the females, the smaller difference 

 in weight according to sex in the insane becomes 

 explicable. 



