416 [Jan. 22, 



enough of the volatile hydrocarbon to determine its boiling-point, 

 which proved it to be pure amylene. If the heat be carefully regu- 

 lated, the amount of charcoal remaining in the retort is comparatively 

 small. The interpretation of the phenomena observed is given in 

 the following equation : 



C 30 H 39 N 2 I=2C 10 H 9 N+C S H u I+C S H 10 



Green iodide. Lepidine. Iodide of Amylene. 



amyl. 



Here, again, I have had an opportunity of proving the presence 

 in the crystals of a small quantity of the homologous chinoline com- 

 pound ; for on submitting, after separating the iodide of amyl, the 

 hydrochlorate of the volatilized base to distillation with potassa, 

 and collecting apart the first quantity of the basic liquid which came 

 over with the vapour of water, this substance proved by the plati- 

 num determination to be chiefly chinoline, while the portion of the 

 base distilling last proved by the same mode of analysis to be pure 

 lepidine. 



The results obtained in these experiments furnish new illustrations 

 of the tendency to molecular accumulation by which the ammonias 

 and their derivatives are distinguished. Only a few weeks ago I 

 had the honour of submitting to the Royal Society a short ac- 

 count of this class, which is obtained as a secondary product in the 

 manufacture of aniline. The coloured derivatives of the bases of the 

 chinoline series present in their composition considerable analogy 



with paraniline. 



Aniline series. 



C 6 H 7 N C 6 H 7 N, HC1 



Aniline. Chloride. 



C 6 H 7 N C 6 H 7 Nj Ha C 6 H 7 N)HC1 



C 6 H 7 N C 6 H 7 NJ* C 6 PI 7 NJHC1 



Paraniline. Monacid chloride. Diacid chloride. 



Lepidine series. 

 C 15 H 19 NH 2 C 15 H 19 N,HC1 



Hydrated oxide of amyl- Chloride. 



lepidyl-ammonium. 



C 15 H, 9 NH 2 01, C 16 H 19 N1 HC , C 15 H 19 N1HC1 

 C 15 H 19 NH 2 OJ ? C^N/ 1 C I5 H 19 NJHC1 



Free blue base. Green iodide, monacid. Yellow iodide, diacid. 



I have written the formulae of the coloured compounds so as to 

 bring out their analogy with the paraniline salts in fact, so as to 



