SULPHUR. 119 



said to prevent the cerebral symptoms produced by quinine, 

 which it readily dissolves, and the after-effects of morphia, if 

 given with these drugs. 



SULPHUR SULPHUR. S. 32. 



An elementary body found native as virgin sul- 

 phur, also as sulphides of metals. 



Sulphur Silbliiiiafiiiil. Sublimed Sulphur. 



Source. Prepared from crude or rough sulphur by subli- 

 mation. 



Characters. A gritty powder, of a fine greenish-yellow 

 colour, without taste or odour until heated. Insoluble in 

 water, soluble in oils and turpentine with heat. 



Impurities. Sulphurous and sulphuric acid ; acid to test- 

 paper. Arsenic, detected by agitating with ammonia, and 

 evaporating. Earthy matters. 



J)ose.2Q to 60 gr. 



Preparations. 



a. Confectio Sulphuris. Sublimed Sulphur, 4 ; Acidj 

 Tartrate of Potash, 1 ; Syrup of Orange Peel, 4. 



Lose. 60 to .120 gr. 



b. Unguentum Sulphuris. Sublimed Sulphur, 1 ; 

 Benzoated Lard, 4. 



From Sulphur Sublimation are made : 



c. Sulphur Praecipitatum. Precipitated Sulphur, 

 "Milk of Sulphur." 



Source. Made by (1) boiling Sublimed Sulphur withj 

 Slaked Lime in water ; (2) precipitating the filtrate 

 with Diluted Hydrochloric Acid, washing and drying. 



(1) 6S 2 + SCalLOn = 2CaS-, -f CaS,ll,0 4 + 2H.0. 1 



(2) 2CaS 6 -|- CaS 2 H 2 4 + 6HC1 == 6~S 2 + 3CaCC + 

 4H 2 0. 



Characters. A greyish-yellow soft powder, free 

 from grittincss and smell of SH 2 . 



Impurities. Sulphate of lime; detected micro- 

 scopically as crystals. Sulphuretted hydrogen ; detected 

 by odour. 



Lose. 20 to 60 gr. 



d. Potassa Sulphurata. Sulphurated Potash. See 

 Potassium. 



Preparation. 

 Unguentum Fotassss Sulphurate. 1 in 15}. 



