352 Journal of Comparative Neurology and Psychology. 



TABLE I. 



The percentage increase in the white and gray substances- 

 and in the total area of the cross sections in the entire cord is 

 graphically shown in the following table : 



TABLE IL 



The percentage increase in cross sectio.is of the white substance from 



birth to maturity. 



Thor. Lumb. 



100 100 



172 308.4 



The percentage increase in cross sections of the gray substance from 



birth to maturity. 



The percentage increase in total area of cross sections of the cord, 

 from birth to maturity. 



[60] 



