1904.] 



of the Gall Bladder of the Frog, 



439 



of the scissor and can be gently drawn by a brush on to the soft china 

 clay electrode, so that the inner epithelial surface, which laid on the 

 scissor blade, now rests on the electrode ; the other electrode can be 

 now applied to the outer smooth muscle fibre surface. If the piece of 

 bladder is sufficiently large a third electrode can be applied to its edge 

 and the effect of stimulation at both surfaces studied by Waller's ABC 

 method. 



In the experiments of March 10 the blaze was directed from the 

 mucous to the serous surface and was of considerable magnitude, but 

 the sixth excitation elicited a response in the antidrome direction 

 before giving one from mucous to serous. In experiment of July 21 

 there is also blaze from mucous to serous. 



The following figure gives a plan of the position of the electrodes 

 and tissue in the ARC experiments. Unless otherwise stated in the 

 following tables the + sign signifies from mucous to serous and 

 - signifies from serous to mucous. 



-fA 



-B 



5000- 

 10000 + 



A. 



-0-0008 



-off 



-0-0125 



-0-0160 



- 0-0020 



+ 0-0020 



-0-0060 



of Bladder (March 10). 



- Means from mucous 

 to serous. 



- O'OIOO 



Gall Bladder. 



5000- +0-0066 



+ - 0-0058 



10000+ -0-0083 



- +0-0100 



Envelope (March 24). 



+ 0-0004 



- 0-0009 

 + 0-0010 



- 0-0025 

 -0-0025 



5000- 



+ 

 10000- 



+ 

 + 





55 



VOL, LXXIV. 



The layers were not 

 properly separated. 



2 K 



