1863.] 413 



or four crystallizations, was fully confirmed when the chloride was 

 submitted to a systematic partial precipitation by dichloride of 

 platinum. After several repetitions of the process, the partially 

 precipitated platinum-salt being decomposed by sulphuretted hydro- 

 gen and the chlorides again partially precipitated, two platinum-salts 

 were obtained, one of which, the less soluble one, proved to be the 

 pure platinum-salt corresponding to the iodide with 30 equivalents 

 of carbon, whilst the other one was sufficiently pure to show that it 

 belonged in reality to the homologous iodide with 2 equivalents of 

 carbon less. 



The amount of the iodide 



C 28 H as N 2 I, 



which contaminated (if the term may be applied to so beautiful a 



substance) the iodide 



C 30 H 39 N 2 I, 



is, however, so small that its presence did not materially influence 

 the analytical results obtained in the further examination of the 

 compound. 



The explanation of the formation of the iodide presents no diffi- 

 culty ; this substance obviously derives from lepidine, 



C 10 H 9 N, 



whilst only the slight admixture is due to the presence, in the 

 original bases submitted to the action of iodide of amyl, of a small 

 quantity of chinoline, 



C 9 H 7 N. 



In fact Mr. Williams, in describing the preparation of his dye, 

 distinctly states that the chinoline by no means requires to be pure 

 for the purpose. M. Menier has moreover kindly furnished me with 

 a considerable quantity of the crude material from which the green 

 crystals are obtained. This proved to be a mixture of several bases, 

 in which the presence of lepidine and chinoline was traced without 

 the slightest difficulty, by the analyses of platinum- salts. 



In the genesis of the new iodide two different phases have to be 

 distinguished, viz., 1, the transformation of lepidine into iodide of 

 amyllepidyl- ammonium, 



C 10 H 9 N + C 5 H U I C 15 H 20 NI; 



Lepidine. Iodide of amyl. Iodide of amyl-lepidyl-ammonium. 



