1904.] the Cat's Foot duelled hy the Electrometer 



97 



Fig-. 8. — To illustrate summation of stimuli. Effects of 1, 2, 3, 3, 2, 1 

 instantaneous make-break shocks. 



Response to 1 shock. 

 2 

 3 



•0035 volt. 

 •0097 

 •0130 „ 

 •0120 

 •0087 

 •0023 



fnfre 



F 



■eg. 



Freq. 



O 10 20 30 <W 50 60 SeC5. 70 



Fig. 9. — To show that the effect of frequent is greater than that of infrequent 

 stimuli. The first response, aroused by five shocks at an interval of 2 seconds, 

 is an incomplete tetanus with a maximum value of O"0O4O volt. The second 

 and third responses are each to five shocks at an interval of about ^th second, 

 and reach maximum rallies of - 0123 and 0'0120 volt. 



VOL. LXXIII. 



H 



