53^ THE MKDICIXAI. Sl'RINGS OF SOUTH AFRICA. 



out in a small valle\' between the Isinuka hills. The ori<^inaI 

 opening has been enlarged to form a ])rimitive bath in the lime- 

 stone 4 feet X 3 feet X i foot deep. The water trickles into 

 this from openings in the sides, and there is a continual bubbling 

 of sulphuretted hydrogen through the same openings. The 

 water smells strongly of the gas, and is fairly milky in appear- 

 ance. The spring described as Isinuka II is about lOO yards 

 distant ifrom the hrst, and issues from the bank of the Isinuka 

 stream. There w'as a good flow formerly, but the volume of 

 water has diminished almost to a mere trickle. There is no pro- 

 vision for medical treatment, and the bathing facilities are en- 

 tirely inadequate. The springs are free of access to all comers, 

 and are used principall}- by the natives. The water is a powerful 

 pur^iative and ditiretic, and it also has the reputation of being 

 beneficial in borh articular and muscular rheumatism. The 

 springs issue close to a fault between the Dwyka conglomerate 

 and the Table Mountain sandstone. There is a deposit of cal- 

 careous tufa on the spot. The spring Isinuka I has a tem])era- 

 ture of 67°F. 



11. Matjcsfontcin. 



Table of Ion Equivalents. 



Cations. Anions. 



Na 0.521 Ci 0.907 



ta 0.435 SO4 o.igi 



Mg 0.500 HCO, 0.180 



Al 0.145 



Total 1.60T Total 1.27S 



The analysis is taken from the Report of the Senior 

 Government Analyst, Cape of Good Hope, for 1897. All my 

 efforts to obtain jjositive information about the exact site, etc.. 

 proved unavailing. Nobody seems even to be aware of the exis- 

 tence of such a spring. The original report describes the water 

 as being comparable to that of Aix les Rains (Savoy). 



12. Zongala Geyser. 



^rhe Zongala geyser (17° 3C S(nith Lat., 27° 28<' luist 

 Long. ) , Northern Rhodesia, rises through stratified sandstones, 

 grits and conglomerates. These overlie the aluminous 

 .shales of the coal series. The eyes of the springs are 

 surrounded l)y deposits luainly of crystalline calcite. The 

 similarity in the mineral contents of the two geysers has 

 led to the inference that the Zongala geyser has its origin, like 

 Ihe Goa one, in granite underlying the shales. There are alto- 

 gether eight springs, one of which ejects water and steam with 

 a hissing noise to a height t)f 7 feet. The tem])erature of the 

 hottest si)ring is 97°C, of the coldest 52°C. The total amount 

 of water in all the springs is S6.000 gallons i)er day. The water 



