Intelligence and Miscellaneous Articles, 237 



This salt is composed of 



Chloric acid . . 38-49 

 Oxide of lead. . 56' 92 



Water 4-59 



100- 

 Chlorate of Silver. — A neutral solution of this salt is obtained by- 

 dissolving oxide of silver in chloric acid ; this yields by evaporation 

 distinct prismatic crystals ; chlorate of silver is anhydrous ; it dis- 

 solves in about five parts of cold water, and likewise in alcohol with- 

 out suffering alteration ; it fuses at 446°, and begins at 5 18° to give 

 off oxygen with a trace of chlorine ; when heated until the evolution 

 of gas ceases, chloride of silver remains. The evolution of oxygen 

 is much more ready and rapid if the salt be mixed with oxide of 

 copper or peroxide of manganese. If chlorate of silver be heated 

 very rapidly, it decomposes suddenly with explosion and the extri- 

 cation of light. When mixed with combustible bodies, it detonates 

 by percussion much more strongly than the potash salt. 

 It is composed of 



Chloric acid .. 39-37 

 Oxide of silver 60-63 

 100- 

 If chlorine be passed through water containing oxide of silver in 

 suspension, chlorate of silver is also formed ; but if the current of 

 chlorine be too long continued, this salt decomposes and oxygen gas 

 is evolved, and there are formed chloride of silver and free chloric, 

 not perchloric acid. By the action of hypochlorous acid on oxide 

 of silver, or also upon finely divided metallic silver, no chloric acid 

 is formed, but a mixture of peroxide of silver and chloride of silver. 

 Ammoniacal Chlorate of Silver. — Prismatic crystals of this salt are 

 obtained by dissolving chlorate of silver in ammonia, and evapora- 

 ting the solution ; these crystals are very soluble in water and in 

 alcohol; they melt at 212° and lose their ammonia, and when the 

 temperature does not exceed 534° pure chlorate of silver remains ; 

 when heated rapidly they decompose with explosion and the emis- 

 sion of light. The solution of this salt yields, on the addition of 

 potash, a gray precipitate of Berthollet's fulminating silver. 

 This salt is composed of 



Chlorate of silver 84-81 



Ammonia 15-19 



100- 

 Journ. de Pharm. et de Ch., Mai 1844. 



ON THE PROPERTIES AND COMPOSITION OF THE PROTOXIDE OF 

 GOLD. BY M. L. FIGUIER. 



The modes of preparing the protoxide of gold proposed by the 

 chemist above named were stated in the last Number of the Philoso- 

 phical Magazine ; we proceed now to state the 



Properties of the Protoxide of Gold. — In the state of hydrate it is 

 of so dark a violet colour as to appear black ; when dried it has the 

 violet-blue colour of the powder of Cassius. It does not decompose 



