432 Mrs. A. M. Waller. On the " Blaze-currents " [Dec. 1, 



fibres is a layer of connective tissue. Th,e simplicity of structure in 

 the frog may perhaps account for the large electrical changes observed ; 

 in the cat's gall bladder there is little or no response to stimulus. 



Gall Bladder Washed out with Salt Solution and then Tested (May 7). 



Response in voltage. 



Coil-atS.s. 5000- = +0-0020 -0-0010 



+ = -0-0003 



10000+ = -0-0010 



_ = +0-0030 -0-0005 



- = +0-0005 -0-0001 



The Gall Bladder "syringed out and fitted with Salt Solution. 



Coil at 10000+ = - off 

 Shunt i + = -0-0060 



- = +0-0050 



5000- = +0-0020 -0-0005 

 + = -0-0022 +0-0001 



The bladder is now cut open and spread on electrode with mucous 

 inner surface to A, the upper electrode. 



Coil at 10000+ = 



= + 



_ i 



+ = 



Tested by Waller's ABC method,* the response at both poles is 

 found to be antidrome. In some cases the response is diphasic at 

 the anode, and diphasic at the kathode, see Experiment of May 7th. 



By this method the local reactions at anode or kathode can be 

 examined ; C is an indifferent point at which an electrode is placed 

 which has not been excited. By means of a switch key the excitation 

 is made through electrodes at points A and B. Any initial current 

 through AC is compensated if it is wished to examine A, and any 

 initial current through BC is compensated if it is wished to examine 

 B. It sometimes happens that AC and BC require compensation in 

 the same direction and of the same magnitude, and then it is permissible 

 to switch the key on to either one or the other, and examine the 

 direction of the current ; in the following experiments dotted lines 

 signify that this has been done. 



* On " Skin Currents," ' Roy. Soc. Proc.,' vol. 69, p. 181. 



