Headden — Group of Radium-hearing Springs. 301 



gests to me simultaneously the taste of hydrogen sulphide and 

 that of hydrogen peroxide. 



All the springs of this group with the exception of the 

 Alum Spring furnish drinkable waters, but the preferred ones 

 are the Drinking Spring and the Black Spring. The water of 

 the Alum Spring is so astringent that its character becomes 

 apparent to one immediately upon tasting it. 



Black Spring. 



This is the most westerly spring of the group of any size ; 

 its diameters are 30 and 48 inches respectively. The flow is 

 not very strong and is accompanied by a continuous but mod- 

 erate discharge of gas. The water is clear and has a temper- 

 ature of 1T'5° C. 



The presence of the following substances is not noted in 

 the analyses : sulphides other than hydrogen sulphide ; titanic, 

 phosphoric, and dithionic acids. I could not examine the 

 waters until the samples had become so old that a determina- 

 tion of the sulphides and the dithionic acid would have been 

 of but little or no value. 



I determined the dithionic acid in the water of the Black 

 Spring while the sample was comparatively fresh ; its value, 

 however, is not great, for the sample was already several days 

 old. Phosphoric acid is present in minute traces ; titanic acid 

 also, but the reactions for the latter were very faint, and may 

 have been erroneously interpreted. I did not detect either 

 caesium or rubidium in the amounts of water used, from three 

 to six liters. 



Analysis of Black Spring. 

 Calculation of Cations. 

 Per liter. 



Na 1-1978 0-051964 



K_ 0-0589 0-001504 



Li 0-0016 0-000224 



NH 4 0-0013 0-000074 



Ca -_. 0-1261 0-003152 



Ba __ _ None 



Sr ._ 0'0035 0-000039 



Mg 0-0609 0-002500 



Fe 0-0012 0-000021 



Al 0-0046 0-000168 



Mn 0-0040 0-000072 



Zn Trace 



Sum 1-4599 



Monivalent ions. 

 0-051964 

 0-001504 

 0-000224 

 0-000074 

 0-006304 



0-000079 

 0-005000 

 0-000042 

 0-000504 

 0-000144 



0-065839 



