445 



F904.] of the Gall Bladder of the Frog. 



The experiment of July H agrees with the experiment of July 21 in 

 tnat the direction of blaze was from mucous to serous. 



The envelope of the gall-bladder behaves like all the mucous mem- 

 branes in that there is a tendency for the blaze current to pass from 

 mucous to serous tissues, but this effect is constantly masked by the 

 negative or antidrome blaze peculiar to this organ. The ABC method 

 shows that the serous surface displays the antidrome blaze more 

 readily than the mucous surface. 



Envelope of Gall Bladder. 



Coil at 5000- = +0-0003 - 0-0007 



+ = -0-0001 



10000+ = -0-0003 +0-0003 



- = +0-0010 



5000 



August 3. 



nil 

 nil 



+ 0-0022 

 + 0-0005 



- 0-0003 



- 0-0008 



+ 0-0009 



+- +0-0019 



Envelope. 



5000+ = -0-0008 

 + 0-0002 



10000- - +0-0005 

 + = -0-0007 



-0-0022 -* -0-0017 



August 11. 



Envelope. 



5000- - +0-0005 -0-0009 



+ - -0-0002 



10000+ = -0-0006 



_ = +0-0008 



These experiments show the gall bladder to be an organ whose 

 tissues possess great "chemical lability," the kathode of the single 

 induction shock is more effective than the anode whether the stimulus 

 occurs in the smooth muscle fibres or in the columnar mucous epithelium, 

 so that the blaze is first post kathodic, then post anodic. Occasionally 

 the usual mucous to serous blaze occurs, but of the two components 

 of the structure, the smooth muscle fibres appear to give the blaze 

 current more readily than the columnar epithelium. 



