469 



City Water. 



Bloomington, Ind. . 

 Bloomington, Ind . . 

 Indiana University . 



Oxford, Ohio 



Union City , Ind 

 Celina, Ohio 



Location. 



Curies 



Per 

 Liter. 



Wells. 



S. R.R., Morning Sun, Ohio 



J. S. R., Farm. One mile north Morning Sun, Ohio. 



C. McQ. One mile south Morning Sun, Ohio 



Forest Park. Six miles east Union City, Ind 



Melted snow water 



Boiled water 



Aug. 27, 1914. 



Aug. 27, 1914. 



Sept. 2, 1914. 



Aug. 18, 1914. 



95. 



70. 



200. 



185. 



6. 



00. 



In some papers the radioactivity of springs is given in Mache units. 

 One mache unit = 364. X 10 -12 curies per liter. (Le Radium, Vol. XI, p. 5, 

 1914.) In several papers higher ratios have been used, 500. X 10 -12 in some 

 cases. 



The radioactivity of these springs is not great, but it is high compared 

 with ordinary springs of some localities. There is a great deal of variation 

 from spring to spring, but this may be explained by assuming that some em- 

 anation has been given up before issuing from the ground. The variation of 

 the same spring from time to time is dealt with in another paper. 

 Department of Physics, 



Indiana University, December 21, 1914- 



