Lakes and Springs on the Turko-Persian Frontier. 261 



No. 2. Ferruginous Saline Spring, Derik near Selmas. 



This sample was collected on the same day as that last men- 

 tioned, and had the same temperature, 96° F. 



It smelt distinctly of sulphuretted hydrogen, and by exposure 

 to the air became opake from the deposition of finely divided 

 sulphur ; there were also floating in it granular particles of car- 

 bonate of lime. 



Its specific gravity was 1"0016, and it left on evaporation only 

 1 26*22 grains in the gallon of solid residue, closely resembling 

 the saline constituents of the former spring in composition. 



The quantity of iron was so small that it scarcely deserves the 

 title of "ferruginous;" indeed in the small quantity of water 

 sent me, it was impossible to determine its amount. 



No. 3. Chalybeate Spring at Tufa deposit. 

 First Caravanserai in ravine between Kho'i and Kolin. 

 The specimen bottle of the water of this spring was collected 

 on the 23rd of August, 1852. It possessed the same smell of 

 sulphuretted hydrogen as the preceding, and gave a deposit of 

 sulphur by exposure to the air; it also contained a considerable 

 quantity of free carbonic acid. 



Its specific gravity was 1*0056, and it yielded on evaporation 

 a quantity of solid residue, amounting to 420'113 grains in the 

 gallon ; in composition more resembling the sulphur spring of 

 Issi Su than the saline ones of Deiik, but forming, as it were, a 

 connecting link between them. 



The saline matter contained lime, magnesia, and the alkalies, 

 (but the iron was in such small proportion that the spring scarcely 

 deserves the name of chalybeate) ; also chlorine, sulphuric and 

 carbonic acids, and silica, of which I succeeded in determining 

 the following quantitatively : — 



Lime .... 11*25 grains in the gallon. 

 Magnesia . . . 6*05 

 Chlorine . . . 102*40 

 Sulphuric acid . 3 "52 

 From which it may be approximatively deduced, that the follow- 

 ing are the saline constituents in a gallon of the water : — 



Chloride of sodium . . . 168*74 



Carbonate of soda .... 217*00 



Sulphate of lime .... 5*98 



Carbonate of lime .... 15*69 



Carbonate of magnesia . . 12*70 



Iron and silica traces 



Total 



420*11 grains. 



