■ Scientific Intelligence. —Cliemistry. 153 



KircofF consists in evaporating new milk by a very gentle fire and very 

 slowly, until it is reduced to a dry powder. This powder is to be 

 kept in bottles carefully stopped. When it is to be employed, it is 

 only necessary to dissolve the powder in a sufficient quantity of wa- 

 ter. According to M. KircofF, the milk does not by this process, lose 

 any of its peculiar flavor. — Idem. 



17. Decomposition of carburet of sulphur, hy loeak electric action. 

 — Place in a tube some carburet of sulphur, and over it . a solution 

 of nitrate of copper which has a less specific gravity, and plunge a 

 strip of copper in both fluids. This establishes a pile. The car- 

 buret is decomposed as well as a part of ihe nitrate ; a large quantity 

 of crystals of protoxide of copper is deposited on the strip, and of 

 carbon on the sides of the tubes in thin plates of a metallic aspect. — 

 Acad, de sc. 27 Juillet. 



18. Combinations of bromine, by C. Lowig. — Bromate and bro- 

 mide of mercury. — These two salts are easily obtained by mingling 

 together oxide of mercury, bromine and water. Alcohol separates 

 them dissolving very little of the bromate. 



Bromide of Lead. — Minium digested with brome and water, pro- 

 duces bromide and the puce colored oxide of lead. By filtering the 

 Hquid, after warming it, the bromide crystallizes in splendid white 

 needles. Its properties are similar to those of chloride of lead. 



Bromate of silver is soluble in ammonia but not in nitric acid. It 

 deflagrates on charcoal like saltpetre. 



Bromate of potash. — A mixture of this salt with sulphur inflames 

 by means of sulphuric acid, or by percussion. 



Hydrate of brome is formed very easily at a temperature of AP to 

 6° cent, by passing the vapor of brome into a tube moistened with 

 water. In a quarter of an hour the tube is filled with the hydrate. 



Bromide of potash. — Brome acts upon carbonate of potash ex- 

 actly like chlorine. The compound destroys colors almost as prompt- 

 ly as chlorine, and the weak acids separate the bromine. Caustic 

 potash acts differently ; it forms instantly bromate of potash and bro- 

 mide of potassium, and does not destroy colors. 



Bromide of lime is obtained by adding bromine to an excess of 

 cream of lime. The filtered liquid is yellow, and discolors in a 

 high degree. Bromine and oxygen are disengaged by heat, and 

 Vol. XVIII.— No. L 20 



