go 



Journal of Comparative Neurology and Psychology 



TABLE IV 



Summary of i6 experiments on the effect of stretching the nerve 

 on the rate of the nervous impulse in the pedal nerve of ArioUmax 

 coliiDihiauus. 



Average rate in the stretched nerve: 34.6 cm. per sec. 

 " " " relaxed " : 37.1 cm. per sec. 



five experiments (Table IV, Nos. 3, 10, 11, 14 and 16) the 

 rate of the impulse in the two conditions in the nerve is identi- 

 cal, and in two experiments (Table IV. Nos. 13 and 15) the 

 rate in the stretched condition is slightly higher than that in the 

 relaxed or contracted condition. The average rate of all the 

 sixteen slugs is 35 cm. per sec. for the stretched nerve, and 37 

 cm. per sec. for the contracted nerve. But these differences 

 are slight when one considers the difficulties in applying the 

 peripheral electrodes to exactly the same point of the nerve 

 throughout the successive alternations, and the difficulties in 

 obtaining exact measurements of the length of the nerve, be- 

 cause of the necessary shifting of both pairs of electrodes, not 

 to mention the difficulties in obtaining comparable tracings, due 

 to the unequal relaxations of the muscular part of the prepara- 

 tion. The records leave no doubt in regard to the uniformity 



