MancJiester Memoirs, Vol. hv. (1910), A^(?. 13. 15 



To determine whether higher values for this back 

 E.M.F. were hkely to be reached, the following experi- 

 ment was attempted. 



A steady direct current of 21 milliamperes was first 

 passed through the patient for about two minutes, the 

 necessar)' pressure amounting to 30 volts. This current 

 was then quickly reduced to a safe value, and the 

 commutator-motor started. When rapid determinations 



Taule VI. 



of the polarisation were now carried out, considerably 

 higher values were attained. 



Three consecutive experiments gave the numbers 

 0'833, I'oio and 1045 volts respectively. 



SUidy of Effect of Change of Frequency. Whether 

 the frequency was low or relatively high, approximately 

 the same value of resistance was obtained with alternating 

 currents. 



In the following table the lower frequenc}' was 

 furnished by a small motor-driven alternator, capable 



