248 MINERALOGY. 



Moore, Dr. J. M. The Mineral Springs of California. Homoeopathic 



World, vol. xi. pp. 75-78. 

 General composition, temperature, and medicinal values are men- 

 tioned. (See also vol. x. p. 548, 1875.) 



Pryor, R. A. On the supposed Chalyheate Spring at Watford, and 

 on other Medicinal Waters in Herts. Trans. Watford Nat. Hist. 

 Soc. vol. i. pt. 4, pp. 109-111. 

 References to and quotations from works previous to 1831, men- 

 tioning mineral waters at Walton, Barnet, Northaw, Welwyn, Broad- 

 field, and Clothall. The notice in the National Gazetteer of Great 

 Britain and Ireland of a mineral spring at Watford is probably an 

 error in copying. W. H. D. 



Than, Carl. Analyse der Harkanyer Therme. [Analysis of the 

 Thermal Spring of Harkany.] Min. Mitth. Heft i. pp. 1-12. 



The thermal waters of Harkany in Hungary are noteworthy for 

 containing carbon oxysulphide (COS), a gas discovered by Than. The 

 temperature of the water is 62°-6 C, and the sp. gr. at 20° C. 1-00076. 

 Details of analysis are given. A litre contains 6*81 c. c. of the oxysul- 

 phide of carbon in solution. On exposure to air the oxysulphide 

 decomposes thus : C0S-t-H20=C02-hH2S. The spring is further 

 notable for containing -02001 p. c. of Na.COg, and -01297 p. c. of 

 Na^SiOg. The proportion of iodides and bromides is likewise high* 

 Gas is abundantly discharged from the spring, and burns with a yel- 

 lowish-blue flame. Analysis of this gas is given. The constituents 

 are COS, CO, CO,, N, H, and CH,. P. W. E. 



Thorpe, Prof. T. E. A contribution to the History of the Old Sulphur 

 Well, Harrogate. Phil. Mag. ser. 5, vol. ii. pp. 50-58. 



Gives a detailed analysis of the water, and a comparison with earlier 

 analyses. The amount of soluble matter has varied since 1783. The 

 proportion of potash has much diminished of late years. The amount 

 of barium salt is unusually large, and appears to be increasing. P. D. 



