8 Gee, TJie Electrical Resistance of the Human Body. 



being 43. This caused a very uncomfortable burning 

 sensation. It is important not to suddenly vary the 

 voltage, and especially not to break the circuit until the 

 voltage has been gradually reduced, for otherwise violent 

 shocks will be administered. 



Tests were next made for the purpose of ascertaining 

 the change of resistance during the time the current was 

 passed. Here it was necessary to have the salt solutions 

 more nearly of the temperature of the body and to take 

 other precautions. Examples of the measurements are 

 given in Tables IV. and IVa. 



Table IV. 

 Time Test with Direct Current. 



The results in two tests on the same person are 

 plotted in Fig. 2 which show that the apparent resistance 

 increases up to a certain point and then gradually 

 decreases and tends to become constant. These observa- 

 tions are important in establishing the production of 

 polarisation which takes time to reach a maximum. 

 Assuming that the true resistance of the body, R^ is that 

 measured by the A . C. method and that the apparent 

 increase of resistance is due to polarisation we have : — 



