490 
The Hottle Spring has remained almost constant, while the Illinois 
Central has fallen from 600. X 10- curies to almost zero. Four readings 
taken on another (J. C. S.) spring are added. Taken all together it is 
noted that in May there was a low value and an increase during Sep- 
tember and another decrease October and December. In a rough way an 
increase coincides with a season of rain and a decrease with dry weather. 
It may be that due to a small flow there is more splashing and trickling 
over rocks near the mouth of the spring and the emanation is lost. 
Indiana University, 
December 21, 191}. 
