132 Boltwoocl — Radio-active Waters, Hot Springs, Ark. 



35° C. to 64° C. and the total solids in the waters vary from 

 170 to 310 parts per million,* while the average amount of 

 solids in all the springs is between 275 parts and 280 parts. In 

 only a few of the springs do the solids fall below 270 parts or 

 rise above 290 parts per million. 



In their general chemical characteristic the waters from the 

 different springs show a marked resemblance to one another, and 

 such a great variation in the activity of the different waters 

 was entirely unexpected. It will be noticed that the most 

 active spring water (No. 70C) is 'over 500 times more active 

 than the least active (No. 52B). 



That these variations were in no way due to the conditions 

 under w T hich the particular samples were collected and tested 

 was shown by the fact that duplicate samples collected at dif- 

 ferent- times and by different persons gave closely agreeing 

 results. 



All of the hot springs are situated on a narrow strip of land 

 about 500 yards in length. No connection can be discovered 

 between the location of the springs and their radio-active prop- 

 erties. The more active springs are widely scattered and 

 adjacent springs usually show great differences in the radio- 

 active properties of their waters. As a general summary it 

 can be stated that it has been found impossible to establish any 

 connection between the temperature, flow, location or chem- 

 ical composition of the waters of the springs and the observed 

 differences in the radio-active properties. 



Another interesting point is brought out by the relatively 

 high activity of the two cold springs as compared with the 

 least active hot springs. It will be noted that the second most 

 radio-active water was that from the cold spring No. 74D. 

 This would seem to indicate that the thermal qualities of the 

 waters and their radio-active properties are due to quite inde- 

 pendent causes. 



The results of this investigation demonstrate the necessity of 

 the quantitative examination of the water from each separate 

 spring in order to obtain a definite knowledge of the radio- 

 active properties of the waters derived from a number of adja- 

 cent, individual sources. 



139 Orange St., New Haven, Conn., June, 1905. 



* A very complete chemical examination of the waters of these springs has 

 been made by Mr. J. K. Haywood of the U. S. Department of Agriculture. 

 The results have been published under the title of " The Hot Springs of 

 Arkansas," Senate Document No. 282, Government Printing Office, Wash- 

 ington, 1902. 



