74 INDUCTION SHOCKS 
TABLE VI 
The Influence of Secondary Resistance upon the Stimulating Values of 
Induced Currents 
Experiment of Dec. 15, 1909. Resistance of Secondary Coil = 1400 
ohms; of Tissue = 1700 ohms. Tissue = Frog's Gastrocnemius, 
Uncurarized. 
Resistance in secondary 
circuit 3100 6100 10,100 15,100 18,100 
Value of Z 4.96 6.81 9.45 12.45 I 4- 1 
Experiment of March i, 1910. Resistance of Secondary Coil = 1400 
ohms; of Tissue = 16,600. Tissue = Frog's Sartorius, Uncura- 
rized. 
Resistance in secondary circuit . . 18,000 28,000 48,000 68,000 
Value of Z 3.97 5.24 6.8 9 
from this table, stronger stimuli are required to produce 
a given physiological effect when the secondary resist- 
ance is high than when it is low. That there is a defi- 
nite mathematical relationship between the effective- 
ness of the stimulus and the secondary resistance is 
shown by plotting these values as a curve. Such a 
curve for the first experiment of Table VI is given in 
Fig. 16. It is virtually a straight line having the gen- 
eral equation 
A 
(I) 
in which Z is the intensity of the shock required at re- 
sistance R to produce the desired effect, and ft and A 
