312 Prof. Hennessy on the Distribution of Temperature. [June 16, 



In this paper he shows that the distillate from cinchonine contains not 

 only a base isomeric with cryptidine, and which he calls dispoline, but also 

 several other homologues of still higher atomic weight. 



The separation of these bases is very difficult. They boil at too high a 

 temperature to allow of separation by means of fractional distillation, and, 

 in fact, most of them distil above the range of the mercurial thermometer. 



The author gives the details of the methods employed by him to purify 

 the mixtures of bases from resinous and tarry matters ; they will not, how- 

 ever, be quoted in this abstract. 



After trial of various methods of separation, the author finally adopts 

 fractional precipitation of the platinum-salts. By following out this method, 

 he obtained the platinum-salts of the following bases : — 



C'' H^^ N Dispoline. 



Q13 JJ15 JVJ 



He has not given names to the homologues above dispoline. 



Summary .—Tht author concludes from the results of the first portion of 

 the investigation of which the above is an abstract, that the base, of the 

 formula N, existing in the distillate from cinchonine, is distinct from 

 that obtained from Dippel's oil. 



He submits also tbat the second portion of the investigation shows the 

 chinoline series to consist of no less than eight members, three of them 

 being isomeric with certain bases from coal-oil. 



In conclusion he calls attention to the fact that the eighth homologue 

 of chinoline differs only by H* NO^ from cinchonine itself, and he is of 

 opinion that bases free from oxygen exist in the distillate from cinchonine, 

 containing almost, if not quite, as many equivalents of carbon as the cin- 

 chona alkaloids themselves. 



V. " On the Synchronous Distribution of Temperature over the 

 Earth's Surface." By Henry G. Hennessy, F.R.S., &c. Re- 

 ceived May 26, 1864. 



(Abstract.) 



The results presented in the author's paper, entitled " On the Simul- 

 taneous Distribution of Heat throughout the superficial parts of the 

 Earth" *, are confirmed and extended in the present communication. 



* June 19, 1862. Proceedings, vol. xii. p. 173. 



