186 
DR. A. D. WALLER THE ELECTROMOTIVE CHAilGES 
or the mouth and the left hand are joined to the electrometer, is now of obvious 
significance. Mouth and right hand are similar points h, h, mouth and left hand are 
dissimilar points h, a. The same remark applies to the contrasting results of 
exploration of one or other hand with either leg. The right hand and either leg are 
points h, a ; the left hand and either leg are points a, a. 
A and B are two points of apex and base respectively. 
A straight line between A and B represents the axis of current between A and B if any inequality of 
potential should arise between the two points. 
The dotted lines c, c, c . . . represent lines of current diffusion. 
A straight line at right angles to the current axis represents the line of zero potential. 
The broken lines a, a, a . . . represent equipotential lines surrounding the point A. 
The continuous lines b, b, b . . . represent equipotential lines surrounding the point B. 
To these results I may now add those obtained when one of the leading-oH 
electrodes is in the rectum. 
Favourable combinations are :— 
Rectum and mouth. 
Rectum and right hand. 
