196 Dr. A. I). Waller. On the [Oct, 23, 



Kesponse from A to C ; no response from B to C. 



Lens atone. Exc. 1000+ gives -0-0025 

 1000- „ -0-0060 



Cornea alone. Exc. 5000 + „ nil. 



5000- „ -0-0005 



2nd lens alone. Exc. 1000 + „ - ■ 0020 

 1000- „ -0-0050 



Completely abolished after immersion in hot water. 



A similar experiment gave similar results : in the first lens the 

 response was completely abolished by compression, in the second lens 

 it was greatly diminished and modified by tetanisation ; the response 

 to - + excitation being at the outset - - , then - + , then + + . 



Excitation -«= > 



Besponse I - ^ 



» n - — — ^ 



„ in — - — i 



Exp. 3. Mackerel. — About 5 hours after death. Lens alone. 



1st lens. Exc. 1000+ gives nil. 



1000- „ 



10000+ „ +0-0007 



10000- „ +0-0005 



2nd lens. Exc. 1000+ „ +0*0050 

 1000- „ +0-0020 



After strong tetanisation for 1 minute. 



1000+ „ +0-0015 

 1000- „ -0-0020 



After compression there is no response at all to '[any strength of 

 excitation. 



N.B. — I was not alive to the orientation of the response in this 

 experiment. The + and - signs may therefore have been transposed 

 in these two experiments. 



Exp. 4. Mackerel. — 24 hours post mortem. Isolated lens. 



1000+ gives -0-0005 volt. 



1000- „ -0-0008 „ 



5000+ „ -0-0010 „ 



5000- „ -0-0015 „ 



After strong tetanisation for 1 minute. 



5000+ „ +0-0010 volt. 

 5000- ., -0-0008 . 



