20 



ROBERT S. ELLIS 



In table 9 I have reduced these measurements to what they 

 were in ^ on the sUde. His sections were prepared by the Nissl, 

 Weigert, and Miiller-platinum methods, so to get the correct 

 values for the thickness of the layers in the fresh cerebellum it 

 would be necessary to correct his measurements by raising them, 

 probably about 15 per cent, to allow for the shrinkage during 

 dehj'dration and embedding. However, I have not done this in 

 the table. The relative thickness of the layers is of course not 

 greath^ affected bj^ shrinkage. 



On consulting his table, several interesting relations become 

 apparent. As shown in the last column of the table, the molecu- 



TABLE 10 



Thickriess of the molecular layer in the lateral lobes of the cerehellum during the 



first two years {man) 



lar layer is relatively thicker in females than in males, and it is 

 also relatively thicker in idiots than in normal individuals. 



I have supplemented Roncoroni's observations by measuring 

 the thickness of the molecular layer during growth. The results 

 are shown in table 10 and in chart 5, and it may be added that 

 the vermis is ahead of the cerebellar hemispheres in the growth of 

 the molecular layer, as well as in other respects already pointed 

 out. Up to the age of about one year the molecular layer is 

 thicker in the vermis, but after that period I find no appreciable 

 difference in the different parts of the cerebellum. 



Krohn ('92) finds that in the asymmetric cerebellum of the 

 cat the molecular layer is thicker in the left hemisphere than in 



