1863.] 501 



These numbers correspond to the formula 



C 48 H 22 N Sb 22 =C 40 H 17 N0 8 H \ p o 



SbOJ U 8U 4 U 12 . 



Theory. 



IT. 



19-85 



620-3 99-98 



It is very remarkable that corresponding crystalline double tar- 

 trates are not obtained by boiling tartar- emetic with many of the 

 other organic bases. 



The following have been tried, but unsuccessfully : 

 Quinine. Aniline. 



Cinchonine. Theine. 



Cinchonidine. Piperine. 



Furfurine. 



March 26, 1863. 



Major-General SABINE, President, in the Chair. 

 The following communications were read : 



I. " Researches into the Chemical Constitution of Narcotine, and 

 of its Products of Decomposition." Part I. By A. MAT- 

 THIESSEN, F.R.S., and GEORGE CAREY FOSTER, B.A. Re- 

 ceived February 26, 1863. 



(Abstract.) 



An abstract of a considerable portion of this paper has already 

 appeared in the form of a preliminary notice * of the first results ob- 

 tained. The most important additional facts now communicated are 

 the following : 



The analysis of five additional specimens of narcotine has con- 

 firmed the accuracy of the formula 22 H 23 NO 7 , which the authors 

 * Proc. Roy. Soc. vol. xi. p. 55. 



