402 



-^th part at boiling temperature — iodine volatilizing if the heat is 

 prolonged. 



Diluted sulphuric acid, sp. gr, r0682, does not dissolve it at the 

 ordinary temperatures, but does so readily with the aid of heat, 

 Sulph. acid, sp. gr. 1-845, rapidly dissolves it. 



Diluted hydrochloj'ic acid has but little action on it, but when 

 concentrated, it almost instantly reddens, without dissoMng it ; 

 upon boiling, it forms a yellow solution, from which minute dark 

 opake radiating aciculse deposit on cooling. 



Nitric acid immediately decomposes it even in the cold : upon 

 raising the temperature, iodine at first volatilizes ; then nitrous acid 

 vapours are evolved. Iodine is probably partially converted into 

 iodic acid. 



Hydro- sulphuric acid passed through its alcoholic or acetic acid 

 solution at once decomposes it, converting the iodine into hydriodic 

 acid, with separation of sulphur. 



Alkalies and alkaline earths in solution at once decompose it, 

 removing the sulphuric acid and leaving a Naples yellow residue 

 containing the quinine and a portion of the iodine ; a soluble iodide 

 of quinine is also formed in ammoniacal liquids. 



