THE PHYSIOLOGY OF ELECTRICAL ORGANS. 



I-., -i i , 



01 05 Oi 03 06 07' 08 09 'JO 



B 



FIG. 296. Outlines of excursions of capillary electrometer records when the capil- 

 lary is connected to one pair of condenser-plates, and another pair, at 3 mm. 

 distance from these, is connected with the two ends of a strip of Malapterurus 

 organ. In A the organ was excited by stimulating the nerve with a single 

 induced current at the moment marked x. The temperature of the strip was 

 15 C. The secondary responses occur at an average interval of 0*0076 sec. ; 

 initial period of delay, 0*0080 sec. In B the organ strip was excited directly 

 by an induced current (heterodromous) ; the temperature of strip was 25 C. ; 

 initial period of delay, 0'0035 sec. ; average interval between secondary 

 responses, 0*0045 sec. 



response passing from the head to the tail end of the strip must be of 

 opposite sign to that of A. When the two strips, A and B, are suc- 

 cessively connected with a capillary electrometer, records of their 



responses are ob- 

 tained, of which 

 the curves A andB 

 in Fig. 298 are an 

 \HecLd illustration. It is 

 end obvious that the 

 \oforgan lower curve is the 

 response of B, due 

 to the excitatory 

 change of A tra- 

 versing its sub- 

 stance. The re- 

 sponse of the 

 secondary prepar- 

 ation B, differs 

 from that of the 

 It is clear, there- 



Capillary 

 circuit 



FIG. 297. 



primary one A, in having an extra period of delay. 



