FORMATION OF A VEGETO-ALKALI. 259 



6-027 grs. salt gave of chloride of silver 2*65 grs. = 10*67 per cent, chlorine. 



6*68 grs. salt gave of chloride of silver 2*92 grs. = 10*60 per cent, chlorine. 



6" 147 gfs. salt gave of double chloride of platinum and ammonium 8*24 grs.=8*45 

 per cent, nitrogen. 



The formula C30 H12 Ng Og, HCI+2HO, reckoned to 100 parts, gives numbers 

 closely agreeing with the preceding ; viz. — 



Carbon .... 55*81 



Hydrogen . . . 4*66 



Nitrogen .... 8*72 



Chlorine .... 10'98 



Oxygen .... 19*84 



100*00 



When a solution of the hydrochlorate of the new base is mixed with one of bichlo- 

 ride of platinum, an insoluble, or sparingly-soluble, bright yellow, crystalline preci- 

 pitate falls, which is a compound of the two bodies. It is blackened and decom- 

 posed by boiling. When heated in the dry state, it melts, blackens, and swells up 

 to a prodigious extent, evolving fumes of sal-ammoniac ; the incineration of the char- 

 coal is slow and difficult. Examined by analysis, the double salt gave the following 



results : — 



Salt employed 7*28 grs. 



Carbonic acid produced . . 10*16 grs. 

 Water produced. . . . . . 1*97 grs. 



In 100 parts, — 



Carbon. ......... 38*06 



Hydrogen 3* 



16*43 grs. salt gave of metallic platinum 3*36 grs., or 20*45 per cent. 



The formula C3oHi2N2 0g, HCl-j-PtClg, calculated to 100 parts, gives — 



Carbon . . . . . 37*97 

 Hydrogen . . . . 2*74 

 Platinum .... 20*90 



Nitrate. — This is a very beautiful salt ; it forms hard, transparent, colourless, and 

 very brilliant crystals, whose form yet remains to be determined. It is freely soluble 

 in pure water, but very sparingly soluble in excess of nitric acid. The crystals 

 effloresce and become opake in a dry atmosphere. In this state they contain 

 C30H12N2O6, NO5-I-HO, as shown by the result of an analysis given below. ^ 



Nitrate employed . . . 5*62 grs. 



Carbonic acid produced . 11*19 grs. 



Water produced . » . 2*02 grs. 

 MDCCCXLV. 2m. 



