420^ M. Balard on a peculiar Substance [Dec. 



Brome 65-10 



Oxygen 34-90 



100-00 



These numbers differ so little from those deduced from direct 

 analysis, that the supposition from which they are derived may, 

 it appears to me, be regarded as true. 



On the Comhinatio7i of Brome wit It Chlorine and Iodine. 



Brome combines with chlorine at common temperatures ; this 

 combination may be effected by passing a current of chlorine 

 through brome, and condensing the disengaged vapours by 

 means of a freezing mixture. Chloride of brome is a reddisn 

 yellow coloured fluid, much less intense than the brome itself; 

 it has a penetrating smell, and it causes the eyes to water; its 

 taste is extremely disagreeable; it is very fluid and volatile. 

 Its vapour is of a deep yellow colour, similar to the oxides of 

 chlorine, but not at all resembling the orange vapour of the 

 brome itself; it causes the metals to burn, and probably forms 

 with them metallic chlorides and bromurets ; chloride of brome 

 is soluble in water ; the solution resembles it in smell and colour, 

 and, like it, rapidly decolorizes tournsol paper, without redden- 

 ing it: consequently it dissolves in water without undergoing 

 any alteration of properties ; but by the influence of the alkalies, 

 it decomposes water. Potash, soda, and barytes, poured into a 

 solution of chloride of brome, produce muriates andbromates of 

 these bases, a property Which exists in chloride of iodine, and 

 which proves that chlorine possesses greater affinity for hydro- 

 gen than brome does, 



Bromuret of Iodine, 



Iodine appears to be capable of forming two compounds with 

 brome ; if these bodies be made to act upon each other in cer- 

 tain proportions, a solid compound is obtained, which, when 

 heated, yields a reddish brown vapour, condensible into small 

 crystals of the same colour resembling fern leaves in form. An 

 additional quantity of brome converts these crystals into a 

 fluid, resembling in appearance hydriodic acid containing much 

 iodine ; this compound is soluble in water, to which it imparts 

 the power of decolorizing tournsole paper without reddening it ; 

 when the alkalies are poured into it, they form hydrobromates 

 and iodates, as may be supposed from analogy. 



Bromuret of Phospliorus, 



Phosphorus and brome put in contact in a flask containing 

 carbonic acid act suddenly upon each other, with the evolution 

 of heat and light ; the result of the combination separates into 

 two portions ; one of thew. is sohd, sublimes and crystallizes in 



