Effect of Adrenalin on the Pupil. 



139 



irritability of the gangliectomized iris was from 3 to 20 times as 

 great as that of the normal iris. The adrenalin effect lasted defi- 

 nitely longer in the operated eye than in the normal. After the 

 smallest doses used this difference was not great, but after the 

 larger doses (e. g., 1/50 c.c. 1 : 1,000 Parke Davis solution) it was 

 marked— for example, the normal iris recovered completely within 

 10 to 20 seconds, while the iris deprived of its ciliary ganglion 

 required from 3 to 4 minutes for recovery. Adrenalin produces, 

 after removal of the ciliary ganglion, a dilatation of the pupil. 



