492 [March 19, 



prepare a few more of them, and likewise to examine the action of 

 iodide of ethyl upon the alkaloid itself. I am indebted for the 

 quinidine which I employed for this purpose to Mr. John Elliott 

 Howard of Stratford. It was perfectly white, and consisted of large, 

 well-defined crystals. Before using it, however, I re crystallized it 

 out of alcohol. The quinidine gave a green colour with chlorine- 

 water and ammonia, and the solutions of its salts all exhibited a 

 fluorescent power almost equal to that of quinine. A solution of its 

 sulphate likewise yielded Herapath's so-called sulphate of iodo- 

 quinidine, crystallizing in long quadrilateral prisms possessing a deep 

 garnet-red colour and the other well-known characters of that salt. 

 343 gramme of pure quinidine, dried at 100C., gave '9315 gramme 

 carbonic acid and "238 gramme water. 



This corresponds to 74*04 per cent, of carbon and 7*71 per cent, 

 of hydrogen. 



The formula C 40 H 24 N 2 O 4 requires 74'08 and 7*4 per cent. 



Quinidine Platinum-salt, C 40 H 24 N 2 O 4 , 2HCl+PtCl 2 . On the 

 addition of bichloride of platinum to a solution of hydrochlorate of 

 quinidine, an immediate precipitate takes place if the solution be cold 

 and concentrated; but if dilute or hot solutions be employed, it 

 only crystallizes out after some time. It is very insoluble both in 

 cold and in hot water, but crystallizes from boiling dilute hydro- 

 chloric acid in brilliant but irregularly-formed crystals, which decom- 

 posed when heated to about 200 C., evolving a peculiar aromatic 

 odour somewhat resembling that of hawthorn. *7485 gramme of this 

 salt, when dried at 150 C., on ignition gave -1995 gramme of 

 metallic platinum. This corresponds to 26'66 per cent. 



The formula C 40 H 24 N 2 O 4 , 2H Cl + 2Pt C1 2 requires 26' 81 per cent. 



Both quinidine and its platinum-salt were first analysed many 

 years ago by Baron Liebig; but as he employed amorphous qui- 

 noidine for this purpose, Gerhardt supposes that he operated on 

 a mixture of the three isomeric alkaloids, quinidine, quinicine, and 

 quinine. 



Quinidine Gold-salt, C 40 H 24 N 2 4 , 2HCl+2AuCl 3 .-The gold- 

 salt is prepared by dissolving quinidine in hydrochloric acid and 

 adding excess of terchloride of gold, when it falls as a bright yellow 

 powder. 



This salt appears to be decomposed by boiling with water, turning 



