142 yournal of Comparative Neurology and Psychology. 



several nerve roots to 92.8 per cent of their value, we obtained 

 the following table. 



TABLE 16. 

 Number of medullated nerve fibers in the dorsal and ventral roots of the spinal 

 • nerves of one side. 



Sums . . 

 Ratios 



14582 

 1.36 — I 



8925 

 1 . 24 — 1 



When the data in Table i6 are thrown into the form of curves, 

 we have the relations exhibited in Chart 6. 



Number of Rbers in Spinal Nerves . 

 2300r 



3000 



1500 



lOOO 



SCO 



JS TT "ET "SH ~Enr TK. "31 



DesidiKftotiof Spinal Nerves. 



CHART 6. 



Showing the numbers of medullated fibers in the spinal nerves of Rana pipiens and Rana esculenta. 



