*232 Scientijic Intelligence, 8^c, 



to consist of water 42*20, sulphuric acid 29*48, oxide of zinc 22*20, 

 oxide of manganese 1*58, magnesia 1*88, iron 1*7. — Central blatt,, 

 June, 1836. 



IV. — ZJtility of Carbonate of Barytes in Analyses. 



Dr. Abich has ascertained that carbonate of barytes fuses at a white 

 heat and loses its carbonic acid, and, in consequence of this property, 

 it affords an excellent means of decomposing aluminous minerals. 

 It is not necessary that the mineral to be fused with it should be 

 converted into a fine powder ; it is only necessary to bruise the 

 mineral in a steel mortar into a rough powder, to mix it with 

 from 4 to 6 times its weight of carbonate of barytes, and expose the 

 mixture in a platinum crucible for 15 or 20 minutes to a white 

 heat; a mass is produced w^hich is quite soluble in muriatic acid. 

 In this way, Abich readily decomposed cyanite, staurolite, andalusite, 

 cymophane, zircon and felspar. He recommends that the platinum 

 crucible should be introduced into a large Hessian crucible, which 

 should be covered with an appropriate lid, luted to the body of the 

 crucible. It should then be placed on a proper support, in a blast 

 furnace, (one of Sturm's, termed Swedish forge, and described in 

 Berthier's Traite des JEssais, is to be preferred,) surrounding the 

 crucible with charcoal and coke. — Ann. de Chim., Ix. 369. 



V. — Adulteration of Nitrate of Silver. 



An apothecary of Giessen has found this salt adulterated with 

 nitrate of lead and oxide of zinc, to the extent of one half. — Ann. 

 der Pharm., xvii. 87. 



VI. — Combination of Sulphur et of Lead with Chloride of Lead. 



Hiinefeld states that when we bring a dilute solution of acetate of 

 nitrate of lead, rendered acid with muriatic acid, in contact with 

 sulphuretted hydrogen water, a reddish yellow precipitate is formed, 

 which is converted into a brown or black state by an excess of sul- 

 phuretted hydrogen. The same occurs with a solution of chloride 

 of lead. Analyses of this precipitate gave 45 sulphuret of lead and 

 35 chloride of lead. He considers it a chemical compound. — Journ. 

 fur praktische Chemie, vii. 27. 



VII. — ChlorO' Sulphuret of Antimony. 



According to Cenedella, when sulphuret of antimony and chloride 

 of calcium are heated together, a dark lead-coloured sublimate of 

 shining needles is obtained, consisting of SI Su^ Cl^ . The Panicea 

 Cinnaberina he finds to consist of Hg Su^ CI ; and Mosaic gold he 

 states contains, besides bisulphuret of tin, some chlorine. — Gazetta 

 Eclett, 1835, 23. 



