Chemical Science, 213 



yellow crystals, very soluble in water. Heated carefully in a glass 

 tube, it fuses, and is volatilized without decomposition ; heated 

 suddenly, it inflames without explosion, and leaves much carbona- 

 ceous residue. 



Carbazotate of Baryta, obtained by heatinjr carbonate of baryta, 

 and carbazotic acid with water. It crystallizes in quadrangular 

 prisms of a deep coloin*, and dissolves easily in water. When heated, 

 it fiiscs, and is decomposed with very powerful explosion, producing 

 a vivid yellow flame. The explosion is as powerful as that of ful- 

 minating silver; a solution of chloride of potassium to which car- 

 bazotate of baryta has been added, produces a precipitate of the 

 potash salt, and not more than 1^ per cent, of potash remains in 

 solution'. 100 parts of the crystallized salt contain, — 



Carbazotic acid . . 69.16 oxygen of the acid . 16 

 Baryta .... 21.60 „ earth . 1 



Water ..... 9.24 „ water . 8 



•>ii;l'~h,!i'p. VMVliV "j 100.00 



Carhattftdte 6f Birrtey obtained like the salt of baryta, forms flat- 

 tened quadrangular prisms, very soluble in water, and detonating 

 like the salt of potash. 



Carbazotate of Magnesia forms very long indistinct needles, of a 

 clear yellow colour ; is very soluble, and detonates violently. 



Carbazotate of Copper, prepared by decomposing sulphate of cop- 

 per by carbazotate of baryta : it crystallizes with difficulty, the 

 crystals being of a fine green colour; it is deliquescent; when heated, 

 it is decomposed without explosion, and even without inflammation. 



Carbazotate of Silver. — Carbazotic acid readily dissolves oxide 

 of silver, when heated with it and water; and the solution, gradually 

 evaporated, yields starry groups of fine acicular crystals of the 

 colour and lustre of gold ; the salt dissolves readily in water; when 

 heated to a certain degree, it does not detonate, but fuses like gun- 

 powder. 



Proto-Carbazotaie of Mercury, obtained in small yellow triangu- 

 lar crystals, by mixing boiling solutions of the carbazotate of potash 

 or soda, and proto-nitrate of mercury. It requires more than 1200 

 parts of water for its solution: for its perfect purification, it should 

 be heated with a solution of chloride of potassium, the insoluble 

 portion separated whilst the liquid is lost, and the peculiar salt 

 allowed to deposit as the temperature falls. When heated, it be- 

 haves like the salt of silver. 



All these salts detonate much more powerfully when heated in 

 close vessels, than when heated in the air; and it was a curious 

 thiug to observe, that those with bases yielding oxygen most rea- 

 dily, were those which exploded with least force) By heating some 

 of the salts previously mixed with chloride of potassium, &c., to 

 retard the action, it appeared that no carbonic oxide, but only car- 



