Intelligence ajid Miscellaneous Articles. 143 



derived from the peroxidation of a small portion of the iron of the pro- 

 tobromide. When again evaporated, the red matter yields a deposit 

 of a similar red colour, rather more of a brick red, which strongly 

 attracts moisture from the air, and is soluble in alcohol ; when treated 

 with sulphuric or muriatic acid, white acid vapours are disengaged. 



It is composed of Iron 15-27 



Bromine S-l'TS 



100 

 BROMIDE OF MAGNESIUM. 

 An excess of calcined magnesia was added to a solution of proto- 

 bromide of iron, and slightly boiled. The filtered hquor when 

 evaporated to dryness yielded crystals, which when purified by so- 

 lution, and dried in a stove, were small acicular prisms, very soluble 

 both in water and alcohol, deliquescent, of a bitter sharp taste, and 

 precipitated in a flocculent state by ammonia, and by heat decom- 

 posed into acid and base. 



It is composed of Magnesium 7*760 



Bromine 92-240 



100 



BROMIDE OF CALCIUM. 



The bromide of iron was decomposed by hydrate of lime ; the 

 liquor was filtered when the precipitate was become brick red. 



Bromide of calcium is very deliquescent, fuses into a whitish mass, 

 and gives out a peculiar smell which has some resemblance to that 

 of bromine, a small quantity of it appearing to suffer decompo- 

 sition. This bromide crystallizes in acicular crystals, which are 

 very soluble in water and alcohol ; its taste resembles that of chlo- 

 ride of calcium. Sulphuric acid disengages a white vapour of hydro- 

 bromic acid, and towards the end, reddish vapours of bromine and 

 sulphurous acid. When analysed by means of neutral oxalate of 

 soda, it yielded such a quantity of oxalate of lime as showed that 

 its composition was 



Calcium 11-974 



Bromine 89026 



100 



BROMIDE OF BARIUM. 

 Protobromide of iron was boiled with an excess of moist carbonate 

 of barytes ; when the precipitate became red, the liquor was fil- 

 tered, evaporated, and calcined. The product, re-dissolved in pure 

 water and carefully evaporated, yicklcd white rhombic prismatic 

 crystals, slightly deliquescent, soluble in water and alcohol, dis- 

 agreeably bitter in taste, undeconiposable by heat, and giving with 

 sulphuric acid, at first thick white vapours, and thin reddish vapours. 

 When treated with sulphuric acid, it yielded such a proportion of 

 sulphate of barytes as indicated its composition to be 



Barium 81-75 



Bromine 6831 



10006 The 



