Fig. 2. Showing the relation of the brain substance lying in front (ordin- 

 ates) of the sulcus centralis to that lying behind it (abscissse). Each 

 symbol represents a half brain. 



The figures are in grams. The long diagonal lines, 38-50, indicate the 

 percentage of the precentral brain weight. The lines marked 400-700 indicate 

 the weights of the hemicerebra. The weights given are reduced to those 

 of the fresh brain. 



