i6o 



Journal of Comparative Neurology. 



9. Ratio between the area of the section of the average 

 cell-body and the total area of the section. 



10. Ratio between the area of section of average cell- 

 body and area of section of substantia grisea containing it. 



A trustworthy determination of the caliber of the medul- 

 lated axones composing the radices anteriores of the segments 

 compared could not be obtained from the sections in all the 

 cases for their preparation was neglected at the time the ma- 

 terial was obtained. In a few instances such as could be deter- 

 mined will be made use of. 



The data to be used in making the above comparisons are 

 accumulated in the following Table : 



TABLE III. 



