1863.] 493 



brown and apparently fusing. It is therefore necessary to precipi- 

 tate it in the cold. Well washed and dried in vacuo, on heating to 

 100 it lost ahout -5 percent., probably hygroscopic water ; when 

 further heated to 1 1 5, it fused, turned brown, and began to decom- 

 pose. -3575 gramme of gold-salt dried at 100 gave '14 gramme of 

 metallic gold. This is equivalent to 39' 15 per cent. The formula 

 C 40 H 24 N 2 O 4 , 2HCl+2AuCl 3 requires 39'2 per cent. 



Nitrate-of-Silver Salt of Quinidine t C 40 H 24 N 2 4 , AgNO 6 . 

 This was prepared by adding nitrate-of- silver solution to an alcoholic 

 solution of quinidine ; the mixture became semisolid from precipita- 

 tion of the above salt in the form of minute needles. These were 

 thrown on a filter and thoroughly washed with cold water, in which 

 they are scarcely at all soluble. The compound was then recrystallized 

 from hot water slightly acidulated with nitric acid ; after filtration it 

 separates, on cooling, in beautiful silky needles, which, on being freed 

 from the mother-liquor and dried between bibulous paper, have 

 almost the lustre of metallic silver, such as is produced on igniting 

 its organic salts. It partially decomposes every time it is re- 

 crystallized, but much more so when spirit is substituted for water, 

 the solution becoming black from reduced silver. 



4 01 'gramme of the salt, dried at 100, gave *115 chloride of silver, 

 corresponding to "08656 gramme of metallic silver. This gives 

 21-59 per cent. According to the formula C 40 H 24 N 3 O 4 , AgNO e , 

 theory requires 21*86 per cent. 



Mercuro-hydrochlorate of Quinidine, C 40 H 24 N 2 O 4 , 2HC1+ HgCI. 

 On mixing solutions of hydrochlorate of quinidine and chloride of 

 mercury, the above salt is precipitated as a white powder. It is 

 slightly soluble in cold water, much more so in hot, especially when 

 acidulated with hydrochloric acid; but it cannot be conveniently 

 crystallized from this menstruum, as it sometimes separates in resinous 

 masses. 



By far the best solvent from which to crystallize is boiling alcohol, 

 in which it is readily soluble, separating in nacreous scales as the 

 solution cools. It fuses at 100 under water, but not when dry. 



626 gramme of the above salt, dried at 100, yields *507 chloride 

 of silver, which gives of chlorine 20'04 per cent. The formula 

 C 40 H 24 N 2 O 4 , 2HCl + HgCl requires 20-00 per cent. 



Zinco-hydrochlorate of Quinidine , C 40 H 24 N 2 O 4 , 2HCl + 2ZnCL 



VOL. XII. 2N 



