168 



SULPHUR. 



c. Sublimed sulphur, in powder. (Flowers of Sulphur, 



Sulphur sublimatum, B.P.) 



d. Ditto, washed. (Sulphur lotum.) 



Note. This specimen differs only from specimen c in having been 

 washed with water to remove traces of sulphurous or sulphuric acid. 



e. Sulphur fused into sticks. (Boll Sulphur, Stone Brim- 



stone, Sulphur in rotulis, Sulphur in bacculis.) 



f. Sulphur, precipitated. (Sulphur prcecipitatum, B.P., 



Pure Milk of Sulphur.) 



g. Ditto. (Sulphur prcecipitatum, P.L. ,1746, Common Milk 



of Sulphur.) 



Note. This article was official in the London Pharmacopoeias until 

 the year 1809, when it was replaced by the pure article represented by 

 specimen/. Specimen g owes its satiny lustre to minute crystals of 

 sulphate of calcium, which it contains in large quantity. See P. J. [2] , 

 vol. ix., p. 537. 



h. Electro-positive sulphur. 



Note. This specimen was made by precipitating a solution of hypo- 

 sulphite of sodium with hydrochloric acid. It differs from ordinary 

 sulphur in being insoluble in bisulphide of carbon, and in being soluble 

 in bisulphide of potassium ; but this peculiarity is lost by age. 



i. Black sulphur. (Sulphur Vivum, Horse Brimstone.) 

 Note. This is a very impure substance. 



18. CHLORIDE. S 2 C1 2 . (Protochloride of Sulphur, Bisulphide of 



Chlorine, Sulphur Monochloride.) 

 a. Liquid. 

 Note. This specimen is probably a mixture of S 2 C1 2 and S C1 4 . 



19. IODIDE. S 2 I 2 . (Sulphur lodidum, B.P.) 



a. Commercial specimen. 



Note. When prepared, this specimen was of a greyish black colour^ 

 but has lost iodine on exposure to the air, and consequently is indefinite 

 in composition. 



20. HYPOCHLOEIDE. (Hypochlorite of Sulphur.) 



a. Powder. 



Note. This is an indefinite compound of chloride of sulphur and 

 sulphur. It is liable to explode spontaneously. See P.J. [3], vol. viii., p. 38. 



21. SULPHUROUS ANHYDRIDE. S 2 . 



a. Condensed gas in a hermetically sealed glass tube. 

 Note. This specimen was condensed by means of a freezing mixture. 

 It was presented by Messrs. Hopkin and Williams. 



22. SULPHUROUS ACID. (Acidum Sulphurosum. B.P.) 



a. Aqueous solution. 



Note. For remarks concerning the manufacture of this acid, see P. J. 

 [1], vol. xviii., p. 512. 



