Scientijic Intelligence. — Chemistnj. 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 botdes carefully stopped. Wien it is to be employed, it is 

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

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

 any of its peculiar flavor. — Idem. 



17. Decomjyosition of carluret of sulphur , hy weak electric action. 



Place in a tube some carburet of sulpliur, 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 the 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. 

 t/lcad. de sc. 27 Jinllet. 



18» Combinations of hromine, hyC. Lowig. — Bromate and bro- 

 mide of mercury, — ^Thcse two salts are easily obtained by mingling 

 together oxide of mercury, bromine and water. Alcohol separates 

 them dissolving very little of die bromate* 



Bromide of Lead. — 3ljnium digested with brome and water, pro- 

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

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

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



Bromate of stiver is soluble in ammonia but not in nitric acid. 



deflagrates on charcoal like saltpetre. 



f potash— K mixture oi this salt with sulphur in/lames 



It 



to 



by means of sulphuric acid, or by percussion 



Hydrate of 



6^ cent, by passing tlie vapor of brome into a tube moistened with 

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



Bromide of potash— Bxome zci^ upon carbonate of potash ex- 

 actly like chlorine. iThe 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. 1. 20 



j 



J 



1C 



