CHINOLINE AND ITS HOMOLOGUES. 



389 



salt is previously moistened with hydrochloric acid, it may be ignited without 

 explosion, and the green oxide estimated with accuracy. The combustion was 

 made with oxide of copper. 



f 6-827 grains of bichromate of chinoline, dried at 212° gave 



I. 1 11-284 



carbonic acid, 



and 









{ 2-146 



water. 











TT f 6-381 

 Llm { 2072 



bichromate of chinoline, 



dried at 212°, 



gave, on 



ignition, 



green oxide of chromium 









III f 5 ' 534 

 m - { 1-787 



bichromate of chinoline, 



dried at 212°, 



gave, on 



ignition, 



green oxide of chromium 











Experiment 







Calculation. 





I. II. 



III. 



*" 







Carbon, 



45-08 





45-11 



C 18 



108 



Hydrogen, 



. 3-49 



• . » 



3-34 



H 8 



8 



Nitrogen, 







5-85 



N 



14 



Chromium, 



..'. 22-40 



22-28 



22-31 



Cr 2 



53-4 



Oxygen, 





... 



23-39 



° 7 



56-0 



100-00 



239-4 



Density of the Vapour of Chinoline. — In Dr Hofmann's paper on the coal bases, 

 he states that a determination of the density of the vapour of leukol (chinoline) 

 failed, owing to its leaving a yellow residue on distillation. I have not found this 

 circumstance to operate sufficiently in the case of chinoline from cinchonine, to 

 cause more error than is usually found in determining the vapour densities of 

 bodies obtained by fractional distillation, and having so high a boiling point. The 

 specimen used, boiled in the fourteenth rectification between 460° and 470° F. 



Temperature of air, 



vapour, . 

 Pressure, 





13° centigrade. 



277° ... 



751 millimetres. 



Capacity of balloon, 

 Residual air, 





330 cent. cub. 

 17-5 ... 



Excess of weight of balloon, 



The formula 





0-4980 grammes. 



C 18 H 7 



N 





U till CO 



18 volumes carbon vapour, 





0-829 . 18 = 14-922 



14 ... hydrogen, 

 2 ... nitrogen, 



c 18 



0-0692 . 14= -9688 

 0-9713 . 2= 1-9426 





17-8334 



Experiment. 



4 



Theory. 

 H 7 N = 4 volumes. 



4-5190 





4-4583 



= 4-4583 



Action of Iodide of Methyl on Chinoline. 

 Hydriodate of MethylrChinoline. — When an excess of iodide of methyl is 

 added to chinoline, and the mixture, inclosed in a pressure tube, is heated for 



VOL. XXI. PART III. 5 N 



