220 THE MEDICINAL SI'RTNflS OF SOUTH AFRICA. 



'I'lie following analytical data will give an idea of its composi- 

 tion.* 



Grams per 100,000. 



Total solids 113-94''^ 



Solid residue on heating to redness T02.465 



SO, ' 37-382 



CaO 5.307 



^IrO 0.437 



cr 12.788 



H.,S 0.425 



K.'O 16.167 



. Na/) : 17.823 



NFI,/ trace 



Tai!li-: of I().\ Kouivalents. 



Cations. Ayiions. 



Na 0.575 X I -■= 0.575 ''^<^4 0-389 X 2 = 0.778 



K 0-343 X I == 0.343 CI 0.3606 X r = 0.3606 



Ca 0.0946 X 2 = 0.1892 . 



AFg 0.0109 X 2 = 0.0218 1. 1 38') 



1 . 1 290 



The figures for the pt>tassium contents are interesting in 

 view oif the paucity of the South African springs in potash. Of 

 the springs in the Union recorded in my previous paper, the one 

 at Kouhad ( No. 14) contain less than one-third of the above 

 amount. The (juantity of sulphuretted hydrogen in the spring 

 is probably much higher, as the analysis was only carried out 

 some time after collecting the water. The radioactivity is stated 

 to be considerable. The spring might be provisionally classified 

 as a sulphur-spring. 



The South-West Protect(>rate is comparatively poor in 

 springs. But there is a zone running through the middle of the 

 country from north to south, practically through its entire length. 

 in which there are quite a large number of springs with an ample 

 supply of water, and all of them of comparatively high tempera- 

 ture.f Some of these are merlicinal. but only teni])erature 

 measurements are recorded. 



Rehoboth 53°C 



Klein-Barmen (Otji Katiti ) 6i-62°C 



Omapiu 61° 



Oniburo, given variously as. . . . 61° and 77°C 



Warmbad and the other springs described in this paper lie 

 in the zone, and a prolongation of the line strikes a number of 

 the hot springs in the Cape Colony, namely, Clanwilliani 



* Dr. ('. Grimme: " Weideverhaltnisse in ryeutsch-Siiclwestafrika," 

 197 (1011). ^'l■l■;■)l^(■IltIi^thllnf^(■Il (ifi- Deutschen rjandwirtsdiafts-Gesell- 



ischaft. 



+ (Ji-iiiniK'. I0C. cit. 



