Action of water on Sulpkurets and haloid Salts. 285 

 in carbonate of ammonia a granular salt is precipitated, for 

 which Schaffgotsch proposes the formula 2 G C 3 H 6 + 3 G H 6 "; 

 this complex proportion becomes somewhat more simple if 

 we tal^e the new equivalent, when we find it to be G C, H 



+ 4-GH. 



In the same volume is also a paper by Ch. Gmelin on some 

 properties of glucina. 



Action of Water on certain Sulphurets and haloid Salts. 



H. Rose has published a most interesting paper on this 

 subject ; most of the experiments were made with sulphuret 

 of barium, which was prepared by strongly heating a mixture of 

 charcoal and sulphate of baryta. t The black mass was treated 

 in a closed bottle with a quantity of water far insufficient to 

 dissolve all the sulphuret ; after standing twenty-four hours it 

 was decanted and a fresh portion added, and this repeated 

 nine times ; each portion was kept separate. The first and 

 second solutions contained hydrosulphuret of barium (H S, 

 Ba S), which was proved by the evolution of sulphuretted hy- 

 drogen, on adding to them a concentrated neutral solution of 

 sulphate of manganese; the sulphur was oxidized by treating 

 the salt with hydrochloric acid and passing the sulphuretted 

 hydrogen into strong nitro-hydrochloric acid ; the sulphur was 

 thus perfectly oxidized. A stream of air was passed through 

 the solution to carry over all the hydrosulphuric acid, and 

 then chlorine passed into it to oxidize any sulphur.- The 

 oxidized fluids mixed together, the sulphate of baryta sepa- 

 rated; in the filtered liquor a large precipitate was produced 

 by chloride of barium. The third solution gave only a slight 

 smell of H S, with sulphate of manganese, but a copious evo- 

 lution with hydrochloric acid. Chloride of barium (as above) 

 produced only a slight precipitate; it contained therefore 

 sulphuret with a small portion of hydrosulphuret. The fourth 

 gave no trace of S H with sulphate of manganese, abundance 

 with hydrochloric acid ; no precipitate was produced by chlo- 

 ride of barium, but a slight one by sulphuric acid ; it con- 

 tained therefore sulphuret and baryta. The fifth contained 

 less sulphuret and more baryta, and the others only a trace 

 of sulphuret. When large quantities of sulphuret of barium 

 are boiled with water the same products are obtained ; some- 

 times hydrate of baryta crystallizes, sometimes sulphuret, and 

 sometimes compounds of both ; the hydrosulphuret is the most 

 soluble product. The composition of one compound, which 



