Intelligence and Miscellaneous Articles. 233 



Protochloride of Antimony and Chloride of Sodium forms laminar 

 crystals, having the composition 3NaCl, SbCl 3 . 



Protochloride of Antimony and Chloride of Barium. — When the 

 solution of the chloride of barium is very dilute, the two salts sepa- 

 rate on cooling, the chloride of barium crystallizes in tablets, while 

 the protochloride of antimony decomposes the water. It is there- 

 fore necessary, in order to obtain this compound, to use concen- 

 trated solutions. It is obtained in minute radiately-grouped needles, 

 the composition of which is represented by 2BaCl, SbCl 3 + 5HO. 

 The protochloride of antimony combines in the same way with chlo- 

 ride of strontium, chloride of calcium, and chloride of magnesium. 



Protochloride of Tin and Chloride of Ammonium forms beautiful 

 fascicular needles, which are permanent in the air, but are decom- 

 posed by water. The analysis of this salt, which had been pre- 

 viously obtained by Jacquelain, gave the formula 2NH 3 , SnCl, HO 

 + 3HO. 



Protochloride of Tin and Chloride of Potassium is obtained by 

 direct combination of the two salts, and crystallizes in beautiful long 

 needles, which are isomorphous with the preceding salts. Its for- 

 mula is 2KC1, SnCl -*■ 3HO. 



Protochloride of Tin and Chloride of Barium yields, on sponta- 

 neous evaporation, beautiful prisms, the protochloride of tin and 

 chloride of strontium long needles. They are represented by the 

 formulas BaCl, SnCl + 4HO and SrCl, SnCl + 4HO. 



Chloride of Sodium and Magnesium consists of NaCl, 2MgCl 

 + 2HO. 



Iodide of Silver and Ammonium. — Iodide of ammonium dissolves 

 iodide of silver, forming with it a deliquescent double salt. It con- 

 tains 2NH 3 , HI, Agl. 



Iodide of Lead and Sodium crystallizes in yellow shining laminae. 

 It is obtained by adding a slight excess of iodide of sodium to a hot 

 solution of iodide of lead, and placing the liquid in a warm spot. 

 Its formula is Nal, 2PbI. 



Iodide of Zinc and Sodium yields, on spontaneous evaporation, 

 prismatic radiately-grouped needles. It is colourless, readily soluble 

 in water and deliquescent. Its formula is Nal, Znl. 



Chloride and Iodide of Lead is obtained by dissolving iodide 

 of lead in a 'solution of chloride of ammonium. On cooling, 

 numerous yellowish crystals separate, which assume the form of 

 needles, and consist of Pbl, 2PbCl. On evaporating the mother- 

 ley, crystals are obtained of 2NH 3 HC1, Pbl + 2HO, in the form 

 of minute, silky, ramified needles ; they become yellow in the air, 

 and are decomposed by water. 



Chloride and Acetate of Lead. — This is formed when chloride 

 of lead is boiled in a porcelain dish with teracetate of lead, to 

 which subsequently a slight addition of acetic acid is made. The 

 solution is evaporated at a gentle heat, when colourless shining cry- 

 stals separate on cooling. The salt has a sweetish astringent taste, 

 effloresces readily in the air, and melts at 180°; it loses its water of 

 crystallization at 228°. The salt is readily soluble in water ; alcohol 



