280 Notices of the Labours of Continental Chemists, 



salt is rather uncertain ; the soda salt does not crystallize, nor 

 do the compounds of the earthy hyposulphites. 



A solution of the potassa double salt added to sulphate of 

 copper causes a brownish-red precipitate, which has the same 



formula as the potassa salt, viz. 3 Hg S + 5 Cu S. 



On adding hyposulphite of potassa to sulphate of copper a 



yellow precipitate is produced, the formula of which is K S 



-f Cu £H- 2 aq ; it dissolves in excess of alkaline hyposulphite 

 and alcohol precipitates from this solution another crystalli- 



zable salt, 3 K S + Cu S + 3 aq. 



A soda salt similar to the first of these has been described 



by Lenz, it dissolves in excess of Na S, and gives 3 NaS 



+ Cu S + 2 aq. 



Rammelsberg has also examined the products of the de- 

 structive distillation of the hyposulphites ; he finds that sul- 

 phurets, sulphates, and sometimes sulphites are formed. — 

 (Poggendorff's Annalen, vol. xlvi. p. 295.) 

 On the Sulphocyanurets. 



Meitzendorff has made an extensive series of experiments 

 on these salts, under the direction of Rammelsberg. The 

 acid was obtained by distilling the potassium salt with tar- 

 taric acid. We will here only mention the chief peculiarities 

 of the salts, and refer the reader for fuller information to the 

 long paper itself. The ammonium and sodium salts are an- 

 hydrous, Na, Cy S 2 and N H 4 , Cy S 2 . The barium, stron- 

 tium, magnesium and calcium salts are crystallized and deli- 

 quescent, Ba, Cy S 2 + 2 aq, Sr, Cy S 2 + 3 aq, Ca, Cy S 2 + 3aq, 

 and Mg, Cy S 2 + 4 aq. The solution of the aluminum salt is 

 decomposed by evaporation into an insoluble basic and a so- 

 luble neutral salt. The crystallized manganese salt contains 

 3 atoms of water; the zinc salt is anhydrous, it combines with 

 ammonia, forming a salt which crystallizes in beautiful cry- 

 stals, it is Zn, Cy S 2 + N H 3 . Cobalt salt does not crystallize, 



it is 2 Co, Cy S 2 + H ; it forms two compounds with ammonia. 

 The nickel salt has the same composition, and the anhydrous 

 salt forms with two atoms of ammonia a crystallizable salt. 

 The crystallized cadmium salt is anhydrous, combines with 

 one atom of ammonia. There are two salts of bismuth, 



Bi, Cy S 2 and Bi, Cy S 2 + 4 Bi + 2 aq. The rf/sulphocyanuret 

 of copper is anhydrous, but retains a little moisture with great 



