ON VARIOUS che:.iical action*. SS§-^ 



loflk place ia the intermediate vessel near the ppsitive 

 wire. 



in anpther process, the two gUss tubes were tilled with 

 solutijon af muriate, of soda, and the intermediate vessel 

 Avi<h soJutioiji -ojf sulphate of silver: paper tinged with tur- 

 nieiic was placed on the positive side, and paper tinged with 

 litmus on the negative ^ide ; as soo^,^ the electrical circuit 

 was complete, soda began to appear in the negative tube, 

 ^nd oximuriati/: acid in the positive tube, and the alternate 

 products lyere exhii^ited passing into the solution of sul- 

 phate of silver, the muriatic acid occasioning a dense heavy 

 precipitate, and the soda a more diffused and a lighter one ; 

 but neither the tiurineric transmitting the alkali, nor the 

 litmus transmitting the acid, had their tints in the slightest 

 degree altered. 



(To he continued.) 



II. 



Extract of a Letter from Mr. J. M. Haussmavn to 

 J/r. Bertkollet*. 



HEN I published ray memoir on Stahl's alkaline tine- Superoxige- 

 ture of steel, I imagined that this superoxigenated sulphate "^^q/"^^^^** 

 of iron would not fail to be examined moie minutely : but ' 



finding myself disappointed in this respect, I cannot re- 

 frain from again calling to mind some of its properties that jts properties, 

 appeared to me striking. These are its being wholly insipid 

 to the taste, when completely deprived of its water of cry- 

 utallization : and of acquiring astringent powers, surpassing 

 those of a<ny other astringent known, as soon as it has im- '''^\[ ^''^^V 

 Mbed moisture from the air, or been dissolved in water. 

 This superoxigenated sulphate of iron produces the most 

 beautiful prussian blue possible; and it may be used witt 

 Advantage in dyeing, particularly for blacks. 



I read With pleasure Mr. Thenard's paper, but I cannot Nitm^Voj^wcJ 

 h^ of his opinion with respect to the nitrate of iron satu- '^O'staliiz^^ 

 jated with ox^en, crystals of which I can easily produce 

 * Annales de Ghimie, Vol. LV III. p> 182, May, 180C. 



i % >yji.th9v^ 



