4X4 M, Balard on a peculiar Substance pJt^i 



brome ; the results of this action are extrication of heat 

 without light, the evolution of azote, and the formation of 

 hydrobroraate of ammonia; I did not observe in any of these 

 cases that a compound was formed analogous to chloride of 

 azote. 



Hydrobromate of ammonia is solid and colourless ; when 

 moistened and exposed to the air, it becomes yellowish, and 

 acquires the property of turning turmeric paper red. It crys- 

 tallizes in the form of long prisms, upon which smaller ones are 

 placed at a right angle ; by heat it is volatilized. 



Hydrohrnmate of Barytes, 



I obtained this salt by shaking the ethereal solution of brome 

 with hydrate of barytes, or by directly combining barytes with 

 liydrobromic acid. Hydrobromate of barytes fuses wheii 

 exposed to heat; it is very soluble in water, and also dissolves 

 in alcohol ; the crystals are opaque and mammillated, and bear 

 no resemblance to those of muriate of barytes. 



Hydrvhr ornate of Magnesia. 



This salt is uncrystallizeable, deliquescent, iaiid, like the 

 muriate of magoesia, is decomposed at a high temperature. 



Bromuret of Lead. ; 



When an aqueous solution of an hydrobromate is dropped 

 into a solution of lead, a white crystalline precipitate is formed 

 resembling chloride of lead in appearance ; this precipitate, 

 Vhen strongly heated, fuses into a red fluid which exhales very 

 "Weak white vapours, which concrete by cooling into a fine 

 yellow matter. 



Bromuret of lead in a moist state is decomposable by the 

 iiitric and sulphuric acid, brome being disengaged in the first 

 tase, and brome and hydrobromic acid in the second ; the great 

 cohesion which it acquires by fusion prevents nitric acid frotn 

 acting upon it; and it can be decomposed only by boiling 

 sulphuric acid. 



Deuiohromuret of Tin. 



T have already remarked that tin is dissolved by hydrobromic 

 -acid, with the evolution of hydrogen. The hydrobromate which 

 results when dried is converted into a proto-bromuret, which 1 

 have only slightly examined, but which I have ascertained to bfe 

 very different from the compound obtained when brome is made 

 to act directly upon tin, and it is evidently a deutobronmret. 



Tin burns when put in contact with brome, and it is converted 

 Into a solid white substance, which has a crystalline appear- 

 ance, and is very fusible, and readily volatilized ; it exhales only 

 traces of white vapour when exposed to the air ; it dissolves ilri 

 water without any sensible extrication of heat, tind k converted 



