I860.] 



of Aqueous Mixtures and Solutions. 



337 



the 45 per cent, has approximately the formula_C 2 H 6 + 3 H 2 (=46 per 

 cent.). 



Some of the physical properties examined seem to he especially connected 

 with each other ; these are : — 



1. Specific heat and heat produced by mixing; for by dividing the 

 number of units of heat evolved by 5 grammes of any mixture by 

 3*411, the elevation of the specific heat of such mixture above the 

 theoretical specific heat is obtained. 



2. Boiling-point and capillary attraction ; by dividing the depression of 

 the capillary attraction by 3 - 6, the depression of the boiling-point is 

 obtained. 



Deville & Hoek have shown the specific gravity and index of refraction 

 to be connected with each other (Ann. de Chim. et de Physique, 3rd ser. 

 vol. v. Pogg. Ann. vol. cxii.). 



Whether the relations thus established between the various physical 

 properties of alcoholic mixtures hold good with other similar substances, 

 or whether these mixtures form a singular exception, must be decided by 

 further research. 



March 18, 1869. 



Dr. WILLIAM ALLEN MILLER, Treasurer and Vice-President, 



in the Chair. 



The following communications were read : — 



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

 of its Products of Decomposition." — Part III. By A. Mat- 

 thiessex, F.R.S., Lecturer on Chemistry in St. Bartholomew's 

 Hospital. Received February 18, 1869. 



(Abstract.) 



In this part the preparation is described of two new bases derived from 

 narcotine. 



1. On the Action of Hydriodic Acid on Narcotine. — When narcotine 

 is heated with fuming hydriodic acid, iodide of methyl is evolved, and 

 on investigating the residue it is found to consist of the iodide of a new 

 base. 



In two experiments made with 50 grms. of narcotine, 45*7 and 46*2 

 grms. of iodide of methyl, and in a third experiment with 100 grms. of 

 narcotine, 91-8 grms. of iodide of methyl, were obtained, 51 5 grms. and 

 103*1 grms. being the theoretical quantity required for the following 

 reaction : — 



C 22 H 23 N 7 +3 HI=C 19 H 17 N 7 +3 CH 3 1. 



