38 



Mr. W. A. Jolly. Rejiex Times in the 















Difference 















obtained by sub- 



Frog. 



No. of 

 experi- 

 ment. 



Days after 

 operation. 



T. 



HomonTmous 

 reflex time. 



Heteronymous 

 reflex time. 



tracting average 

 homonymous 

 from average 

 heteronymous 

 time. 



C 



13 



17 



16 -5 



15-0 



23 -1 











(room) 



15 -2 



21 3 











12-9 

 11 -8 

 13 '5 



13 -7 

 15 -5 

 15 -6 



14 7 



26 -5 

 22 -8 

 17 -6 



— 



8 



D 



14 



3 



19 



14-4 



18 -1 









(after cord 



(rooiu) 



14 -4 



22 -5 









section) 





21 -5 



21 -1 









123 





15 -4 



26-6 









(after decere- 







32 -6 



7 -8 







bration) 











E 



15 



20 



30 



8 -4 



16 -2 



7-8 







(after cord 



(room) 























section) 







/ 









141 















(after decere- 















bration) 











A 



16 



2 



15 -5 



18 -9 



23 -6 











(room) 



19 1 



22 '2 











18 -9 



16 2 



17 -0 



18- 3 

 13 -2 



19 



19- 7 



21 -8 

 28-8 

 26 -5 

 37 -0 

 22-1 

 18-2 



7-2 



B 



17 



1 



15-5 



12-2 



25-8 











(room) 



12 -7 



24 -8 











15 -5 

 18 -4 

 17-8 



29 -0 

 23 -8 

 22 -2 

 17-4 



8-5 



Average of above heteronymous reflexes (25 in number) 23 •7(r 



Average of above homonymous reflexes (28 in number) 15 7 



Average difference 8 "Oo- 



about 8 a can be accounted for by the interposition in these cases of one 

 extra synapse in the crossed path, whose delay has been increased to as 

 much as double, owing to lower temperature or less satisfactory general 

 condition of the preparation. The average homonymous time is practically 

 the same in the two groups of experiments. 



I find it difficult to believe in so great a lengthening of the delay at one 

 synapse, and think it more probable that two extra synapses have been 



