NAT. ORDER. CINCHONACEiE. 31 



It is very soluble in ether, while cinchonine is very little so ; this 

 difference serves as well to distinguish their bases, as to separate 

 them when united. Quinine likewise differs from cinchonine in 

 containing oxygen, and that in nearly as large a proportion as hy- 

 drogen. According to M. Brande, its ultimate parts are nearly as 

 follows: — Carbon 73,80 — Nitrogen 13,00 — Hydrogen 7,65 — Oxy- 

 gen 5,55 — 99,90. Quinine when melted becomes ido-electric, and- 

 acquires the resinous electricity with much intensity when rubbed 

 with a piece of cloth. 



M. Robiquet, in the Journal of Science, has given an analysis of 

 the two sulphates of quinine, but he found that the sub-sulphate lost 

 a portion of its acid during each chrystalization ; he has given the 

 composition of this salt, both after the first and third crystalization, 

 as follows : — 100 parts of Acid Sulphate of Quinine contain — Acid 

 19,1 — Quinine 63,5 — 82,6 — 100 parts of Sub-Sulphate, first crystal- 

 ization, contain — Acid 11,3 — Quinine 79,0 — 90,3. 



The Sulphate of Quinine, when exposed to the temperature of 

 100° (212° Farenheit) becomes luminous, especially when subjected 

 to slight friction. This remarkable property was first discovered 

 by M. Callaud d' Annecey, a French chemist. "M. M. Dumas and 

 Pelleties exposed about three ounces of the sulphate, enclosed in a 

 glass flask, which they kept in a sand-bath for half-an-hour, to the 

 temperature of boiling watei% when it exhibited, on friction, a briliant 

 white light. On passing through the cork of the flask a metalic rod, 

 ending in a point at the internal extremity, and by a ball at the op- 

 posite one, and applying it to the ball of the rod by a voltaic elec- 

 troscope, shaking the flask before each contact, these gentlemen ob- 

 tained the greatest separation of which the rods of the electroscope 

 are susceptible; the electricity was always vitreous. The Sulphate 

 of Cinchonine possesses the same phosjjhorescent property, but in 

 a less degree, and the electric faculty in the same ratio." 



Medical Properties and Uses of Peruvian Bark will be found 

 under the head of Cinchona Officinalis; we shall therefore intro- 



