contained in Coal-gas Naphtha. 199 



is added to cyanol, there is produced a lemon-yellow precipi- 

 tate of carbazotate of cyanol. This salt is soluble in boiling 

 alcohol, and crystallizes from the solution upon cooling. Con- 

 centrated acetic, hydrocyanic and hydrofluosilic acids, when 

 mixed with the anhydrous base, produce no crystals. 



The property which cyanol possesses of forming double 

 compounds with the chlorides of several metals, is very re- 

 markable ; besides those already mentioned it unites with the 

 protochloride of tin and chloride of antimony. These salts 

 are produced when the precipitates, which cyanol forms in 

 their chlorides, are dissolved in hot diluted hydrochloric acid. 

 Upon cooling, well-formed crystals are obtained, especially of 

 the tin compound. 



The double compounds of the oxygen salts are procured 

 with greater difficulty. By mixing sulphate of copper with 

 cyanol, a double salt, which is very prone to decomposition, 

 is deposited, but I could not obtain it in well-formed crystals. 

 Sulphate of copper or nickel, although forming double salts 

 with sulphate of ammonia, always crystallized separately from 

 their solutions when mixed with sulphate of cyanol. 



I tried to obtain alums by replacing the alkaline base with 

 cyanol, but with no greater success. A mixture of sulphate 

 of alumina and sulphate of cyanol concreted after some time 

 into a confused crystalline mass, in which I could not discern 

 any octahedrons. Further, when sulphate of the peroxide of 

 iron was added to sulphate of cyanol the liquid assumed a dark 

 red colour, owing to the oxidation of the latter base, and sul- 

 phate of the protoxide of iron crystallized from the solution. 



Products of the Decomposition of Cyanol. 



Cyanol is remarkable for the great variety of decomposi- 

 tions which it undergoes with other bodies. I have already 

 noticed the blue precipitate which it gives with an aqueous so- 

 lution of chromic acid. If anhydrous cyanol is mixed with 

 dry chromic acid, ignition immediately ensues, the mixture 

 burns with a brilliant flame, emitting an agreeable odour, and 

 oxide of chromium remains. All other bodies which impart 

 oxygen produce with cyanol blue substances similar to that 

 with chromic acid, and this decomposition occurs with so much 

 facility, that my vessels when exposed to the air of the labora- 

 tory sometimes became covered with a bluish-green coating. 



Action of the Oxygen Compounds of Chlorine upon Cyanol. — 



I was engaged in studying the nature of these changes when 



Fritzsche* published some researches which he had performed 



in a similar direction with aniline. He obtained by the action 



* Bullet. Sclent, de St. Peter sb. t. i. p. 103. 



