148 MR JAMES DEWAR AND DR M‘KENDRICK ON THE 
SERIES IIJ.—Rassir’s EvzE.—Sowrce of light, magnesium lamp. Zero, — 60; polarity, — 80; 
total first deflection, 238. 








Observa- | Before impact at After After Effect of Effect of R e 
tions. | intervals of 15 secs. impact. ~ removal. impact. removal. is 
4l 158, 158, 159, 155 156 Fall of 4 | Rise of 1 |) 
159 
42 155, 152, 152, 150 154 Fall of 2 | Rise of 4 | | Light fell in 
152 | these expe- 
43 Waa), Iba, Iya, 150 1554 Fall of 5 | Rise of 2 riments on 
155 | the cornea. 
44 152, 1525 152, 148 149 Fall of 4 | Rise of 1 | | 
152 J 
45 i530). ce 150, 155 157 Rise of 5 | Rise of 2 | Lisht flee 
46 | 155, 154, 154, | 160 LB \nBieror Sel essanel de) eee a 
155 r rete. : 
47 | 150, 150, 149, 152 153 Rise of 4 | Rise of 1 | | an: e 
148-148, 148 J ye. 
4g | 168,168, 168,| 166 167 | Fall of 2 | Rise of 1 | THe ove was 12 
168 adjusted on 
the electrodes, 
49 168 166 167 Fall of 2 | Rise of 1 and light fell 
50 168 165 168 Fall of 3 | Rise of 3 on cornea. 
51 170 166 167 Fall of 4 | Rise of 1 | Readjusted. 
52 180 176 178 Fall of 4 | Rise of 2 
53 180 176 180 Fall of 4 | Rise of 4 
54 180 178 180 Fall of 2 | Rise of 2 



The general result of these observations is, that when light fell on the cornea, — 
there was an average fall of over three degrees on the impact of light, and a 
rise of nearly two degrees on the removal of light ; while on the other hand, 
when the beam fell on the back of the eye, there was always a rise, which we 
believe to be attributable to heat. 
Three observations were made on this eye with a lighted lucifer match as 
the source of illumination. It was found that if the match was held sufficiently 
near the eye so as to heat it, there was a sudden increase in the electro-motive 
force, to the extent of from ten to fifteen degrees; but the light from the 
match was insufficient to affect the retina. The effect of heat in increasing the 
" electro-motive force was observed in many other experiments. 
SERIES IV.—Rassit’s EyE.—Zero, — 117; polarity, — 65 to — 80; total first deflection, 280. 






rva- Before After Af 
ae. impact. ; impact. sata ee aah ae 
55 200 197 200 Fall of 3 | Rise of 3 
56 196 195 No effect | Fall of 1 No rise g flicht 4 y 
57 195 194 No effect | Fall of 1 | No rise odes. Pee 
58 196 194 195 | Fall of 2 | Rise of 1 i ae 
59 196 19507] Novetfect | vail ced Won nice) Ge eae 
60 195 194 No effect | Fall of 1 Norise |} 



