174 



Dr. A. D. Waller. 



Experiment 3. Similar Experiment. Excitation of Right Sciatic at Intervals 

 of only 1 minute. Rapid Exhaustion of the (ingoing) Response. No 

 marked Alteration of Resistance. ? Increase "by Drying. 



Time after 



decapitation. 



Mins. 



25 

 26 

 27 

 28 

 29 

 30 

 31 

 32 

 33 

 34 

 35 

 36 

 37 

 38 

 39 

 40 



Voltage of 

 response. 



Resistance of pad 



(corrected for R. 



of electrodes). 



100,000 ohms. 

 0-0050 

 0-0085 

 >0-0100 



100,000 

 Galvanometer shunted, photograph begins. 



100,000 ohms. 

 0-0100 

 0-0093 

 0-0080 

 0-0060 

 0-0040 

 0-0020 

 0-0005 

 trace 



110,000 



FIG. 3. (4220.) 



Minutes . 



B. DIRECT EXCITATION. A pad of the cat's foot, cut off 1 to 48 

 hours after death, and set up between unpolarisable electrodes as 

 previously described (loc. cit., p. 481), generally manifests a small and 

 gradually increasing ingoing normal current, not exceeding, as a rule, 

 0-0100 volt. With lapse of time this current gradually falls again. It 

 is noteworthy that its direction (ingoing) is from the intact external 

 surface towards the injured cut surface. 



