CHANGES IN HUMAN CEREBELLUM WITH AGE 



9 



is about 10.8 per cent. It is hardly necessary to add that cases 

 such as these two are very rare. They are to be regarded as due 

 to pathological arrest of development either of the cerebellum or 

 of the cerebrum. The range of relative weights ordinarily found 

 is shown in chart 3. 



IDIOTS 



Chart 3 Giving the frequencies of the percentage weights of the cerebellum 

 in five groups of human brains: 18 idiots and imbeciles; 19 eminent men; 45 or- 

 dinary white males; 7-1 nogro males; 33 negro females. 



The significance of the relative size of the cerebellum has re- 

 ceived a great deal of attention since the days of Gall (1807) . His 

 view that it was connected with the sex instinct is well known. 

 Leuret ('39) criticised this theory, and in support of his position 

 he presented the weights of the encephalon and cerebellum in 

 stallions, geldings, and mares; from his results I have arranged 

 table 5. 



