4 Journal of Comparative Neurology and Psychology. 



give in sq. fi the total area of the nerves measured. As indi- 

 cated, the nerves of the frog have increased in area 2.4%, those 

 of the rat, .57%. 



The measurements upon the rat were the last made, after 

 some skill had been acquired in this manipulation, and are prob- 

 ably the more reliable. 



TABLE I. 



To show the effect of the technique upon the eighth, ninth aud 

 tenth spinal nerves of the Frog. Seven specimens. 



Diameter in /.i. Fresh Fiber, 

 Bristle Attached. 



Diameter in u. Diameter in /U. 

 After Being in In 



Osmic Acid i off Colophonium. 

 24 hrs. 



Av. Diam. 



Av. Radii Square 



Percentage difference -f- 2./^cL. 



TABLE IL 



To show the effect of the technique upon the sciatic nerve of the 

 White Rat. Nine specimens. 



Av. Diam. 1039.5 1042.5 



Av. Radii Squared 10S0560.2 sq. // 1086806.2 sq. // 



Percentage difference -(- -57^- 



