8 



ROBERT S. ELLIS 



weights which are between 9.8 and 11.8 per cent of the weight 

 of the encephalon. The extreme range of relative weights for a 

 given weight of the encephalon, as far as my experience goes, is 

 ilkistrated by the two pathological cases shown in table 4. 



The first case is half of the relative weight for the age of forty 

 days, the normal being about 6.7 per cent; the second case is 

 more than double the average relative weight for the adult, which 



01 2 3 4 5 6 7 8 MONTHS 10 



Chart 2 Showing the variations in the weights of the human encephalon and 

 of the cerebellum — both sexes — together with the percentage weights of the 

 cerebellum, during the first ten months of life. The ordinates for the percentage 

 weight of the cerebellum A — A stand at the extreme left. The ordinates for the 

 weight of the cerebellum on the left side just to the right of the foregoing. 

 The ordinates for the weight of the encephalon X X to the right. 



TABLE 4 

 Two extreme variations in relative weight of the cerebellum (pathological) 



