

65 



Treated with acids, this alkali produces a series of fine salts, 

 amongst which the di-iodide deserves to be mentioned ; it equals in 

 beauty the corresponding diphosphonium-compound. 



I have fixed the composition of the series by the analysis of the 

 platinum-salt and gold-salt. 



Platinum-salt. Pale-yellow crystalline precipitate, similar to the 

 diphosphonium-compound, difficultly soluble in water, soluble in 

 boiling concentrated hydrochloric acid, from which it crystallizes on 

 cooling. It contains 



r TT A Pt n FVr TT y (^2*15)3 ASH" op* pi 



14 n 34 aS 2 rl 2 ^O l_V U 2 -J / JJ \ ^sj U1 2> Z ^ ^V 



Gold-salt. The dichloride obtained after separating the platinum 

 in the previous analysis by sulphuretted hydrogen, was precipitated 

 by trichloride of gold ; yellow slightly crystalline precipitate, soluble 

 in hydrochloric acid, from which it crystallizes in golden-coloured 

 plates. The formula of this salt is 



C u H 3l As 2 Au 2 C1 8 = [(C 2 H 4 )" ( ( % H! AsT Cl -> 2 Au C1 3' 



ARSAMMONIUM SERIES. 



Bromide of bromethylated triethylarsonium, as might have been 

 expected, is capable of fixing ammonia and monamines, giving rise 

 to the formation of a group of compounds not less numerous than 

 the bodies mentioned in the phosphorus-series. I have been satisfied 

 to study the action of ammonia upon the bromide. 



Dibromide of Ethylene-triethylarsammonium. 



Reaction complete in two hours at 100. The-product contains 

 the dibromide, 



C 8 H 22 As N Br 2 = [(C 2 HJ" (C * H ^ s ] " Br 2 ; 



this salt is converted by oxide of silver into the stable caustic base 



C 8 H 2 ,AsN0 2 =K C > H .)" (C 2 H,) 3 H 3 AsN]l Q 



^2 J 



the composition of which was determined by the analysis of the 

 platinum-salt and gold-salt. 



Platinum-salt. Needles, difficultly soluble in boiling water, 

 soluble in concentrated hydrochloric acid, from which well-formed 

 crystals are deposited, containing 



VOL. XI. F 



