472 DR ANDERSON ON THE PRODUCTS OF THE 



in cold water, extremely so in hot, and is not decomposed by boiling the solution. 

 It is also soluble in alcohol. 



r9'552 grains of chloride of platinum and petininegave 

 i 5'930 , . , carbonic acid, and 

 ' 3'593 . . . water. 



By three determinations of platinum, the details of which have been already 

 given, the mean per-centage of platinum was found to be = 35-46. 

 These results correspond with the formula Cj Hio N, H CI, Pt Clj. 



100-0 3474-9 



Chloride of Mercury and Petinine. — A solution of petinine in water, added to a 

 solution of corrosive sublimate, gives a white precipitate, which dissolves in a 

 considerable quantity of hot water, from which it is again deposited in crystals. 

 It is much more soluble in alcohol ; and the boiling solution gives a deposit of 

 beautiful silvery plates on cooling. It is decomposed by boiling its watery solu- 

 tion, petinine being driven off, and a white powder deposited. It is readily so- 

 luble in the cold in dilute hydrochloric acid, probably with the formation of ano- 

 ther double salt. 



Products of Decomposition of Petinine. 



The want of substance, which prevented the full investigation of the salts, 

 has likewise curtailed this branch of the subject to a very few observations, which 

 is the more to be regi-etted, as the general properties and low atomic weight of 

 petinine give promise of definite products, which might enable us fully to deter- 

 mine its position in the chemical system. 



When treated with concentrated nitric acid, it dissolves without any remark- 

 able phenomena, and, on boiling, a feeble evolution of nitrous fumes takes place ; 

 but the petinine is attacked only to a very small extent, for, after being kept 

 boding for a long time, and then supersaturated with potass, it evolved the smell 

 of the base apparently unchanged. Solution of chloride of lime immediately acts 

 upon it in the cold, and developes a highly irritating odour, and some compound 

 is manifestly produced ; the solution remains colourless. Bromine water dropped 

 into an aqueous solution of petinine occasions the precipitation of a yellow oil 



