136 



THE GROWTH OF THE BRAIN. 



It appears from this that the insane are not a class 

 with a characteristic brain-weight The absolute in- 

 crease in the weight of the stem is noticeable in both 

 sexes, while the cerebellum undergoes the most decided 

 increase in the case of the male, and both peculiarities 

 are most evident in tall persons. When among the 

 insane we compare the two sexes, it is plain that the 

 difference in the proportional development of the hemi- 

 spheres is slightly less than among the sane. This is 

 probably due to the wasting processes which. tend to 

 reduce the weight of the male encephalon as a whole, 

 affecting especially the cerebral hemispheres ; but when 

 the averages for stature independent of age, and for 

 age independent of stature are taken, they are found 

 strikingly similar under both conditions. The figures 

 are so uniform that a single record of the proportion 

 one for age and one for stature will suffice. 



TABU: 30. SHOWING IN THE UPPER LINE THE PERCENTAGE 

 WEIGHT OF THE SUBDIVISIONS OF THE ENCEPHALON BE- 

 TWEEN 20-40 YEARS, WITHOUT REGARD TO STATURE. JN 

 THE SECOND LINE THE SAME FOR THE GROUPS OF TALLEST 

 INDIVIDUALS, WITHOUT REGARD TO AGE. THE DIFFER- 

 ENCE IN* THE PERCENTAGE OF THE CEREBRUM AT OTHER 

 AGES OR OTHER STATURES is AT MOST -3 PER CENT. (Based 

 on Table 29.) 



