RUBIACEZ., 187 
wn to be adulterated with any of the bitter indigenous 
's of the country. 
) emical composition. —The constituents of Ciiehone bark of 
a Eeost feat Gaperda, 
— Quinine, C2° H2* N2 02, ii alight-oolaene, amorphous, brittle 
ubstance in an anhydrous state, but may be obtained in a 
3H?O 
ions of the salts made with the oxygenated acids possess a blue. 
orescence, and when treated with chlorine water and am- 
nia, a beautiful green solution is produced, known as the. 
lleioquin test. The solutions deviate the plane of polariza= 
n to the left. The quinine salt mostly used in medicine is 
sulphate (C?°H?*N?0%)?,; H?SO', 71120; the theoretical 
tesimal composition of which is— 
Quinine a 74:31. 
Sulphuric acid 11°23 - 
Water of crystallization ..........006.- 14°45 
~Cinchonidine, C!9H?2N20, forms colourless” anhydrous 
ystals. The sulphate is more soluble in water than quinine, - 
the tartrate is very insoluble. The solutions show the 
ne optical behaviour as quinine but to a less extent. 
~Quinidine possesses the same formula as quinine, and the 
olutions of its salts are fluorescent and afford the thalleioquin: 
tion ; it differs, however, in deviating the plane of polariza- 
n to the right. It is — from the other alkaloids as 
n insoluble hydriodate. iiss Ht 
Cinchonine is not very soluble in ether and tialiel The. 
‘ormula is the same as that of cinchonidine, but has a 
ie Opposite action upon polarized light. ee 
morphous alkaloids, called also” Quincsdinaot Chinioiding 
ur in all Cinchona barks and leaves. It is the name give 
ion obtained in quinine factories, ee 
: i yuekon the mother li with -: 
