CHINOLINE AND ITS HOMOLOGUES. 



399 



8-374 grains platinochloride ethyl-lepidine gave 



M 



11-667 

 2-880 



carbonic acid, and 

 . . . water. 





i 





n.{ 



6-377 



1-688 



. . . platinochloride ethyl-lepi 

 platinum. 



dine gave 







„:.{ 



4-952 

 1-317 



... platinochloride ethyl-lepidine gave 

 . . . platinum. 









^ 



Experiment. 



Calculation 







I. II. III. 









Carbon, 





38-00 



38-14 



C 2 4 



144 



Hydrogen, . 



Nitrogen, 



Chlorine, 





3-82 



3.71 



3-71 

 28-21 



N 



C1 3 



14 



14 



106-5 



Platinum, 





26-47 26-60 



26-23 



Pt 



99 



10000 



377-5 



Density of Vapour of Lepidine. — In my former paper on the chinoline bases, 

 I gave 5*14 as the density of the vapour of lepidine, as found by experiment, and 

 I was desirous of ascertaining that of the same base, as extracted from coal-tar, 

 in order to serve as a comparison. It is remarkable to observe the difference 

 which an increment of C 2 H 2 has in modifying the power of substances to resist the 

 decomposing influence of heat. While, in taking the density of chinoline at 531° F., 

 being 71° above its boiling point, the fluid condensed in the balloon was almost 

 colourless, lepidine after exposure under the same circumstances to only 523° F., 

 or 28° above its boiling point, had become nearly black ; this darkening, caused 

 by separation of carbon, prevented me from making the experiment at a tempera- 

 ture as much above the boiling point as in the case of chinoline, and the two 

 sources of error have the effect of making the density come out somewhat too high. 



The formula 



Temperature of air, 



vapour, 

 Pressure, . . . 

 Capacity of balloon 

 Excess of weight of balloon, 

 Residual air, 



Density, . 



15° centigrade. 

 273° 



755 millimetres. 

 331 cent. cub. 



•6745 grammes. 

 6 cent. cub. 

 5-15 



C 20 H 9 N 



requires the following numbers :- 



20 volumes carbon vapour, 

 18 ... hydrogen, 

 2 ... nitrogen, 



= 0-8290 

 = 0-0692 

 = 0-9713 



20 = 16-580 

 18= 1-2456 

 2= 1-9426 



19-7682 



■ = 4-94205 



Density of vapour of lepidine 

 from cinchonine. 



5-14 



Density of vapour of lepidine 

 from coal. 



515 



Theory. 



T = 4-s 

 4-94 



C 20 H 9 N = 4 volumes. 



