204 



Dr. A. D. Waller. On the 



[Oct. 23, 



I give the normal currents, not that they are essential, but because 

 an expert reader might wish to know them. 



Normal, i.e., accidental current BA. _> + -006Z 



CA. i - • 0049 



BC. y + -oo/6 



All response was from the anterior pole ; none from the posterior. 

 The series was repeated with similar results, and now the zincs of the 

 electrodes were transposed so that the connections were — 



Ant. Equat. Post. 

 B C A 



: > 



nib 



niL 

 — >» 



+ -002 



+ ■004 



i.e., as before response only from anterior and not from posterior pole. 



Now the lens is turned round — the zincs left reversed as before — 

 and the connections thus revert to : — 



Post. Equat. Ant. 



nib 



— > 



< 



nib 





< ~ 



- •0007 



+--00/0 



Finally, the zincs are replaced so that we have the lens left 

 reversed — 



Ant. Equat. Post. 



B C A 

 ■ > 



+ '0003 

 +•0005 



niL 



nib 



