44 TiXperhnents upon the 



Malaga wine, a fetid taste, without astringency or bitter- 

 ness. 



It precipitates abundantly the infusion of yellow cinchona 

 in brown flakes ; it gives to the solution of red sulphate of 

 jron a fine green colour, and produces therein, some mo- 

 ments afterwards, a precipitate of the same colour. 



Emetic, glue, cinnamon cinchona, experience no change 

 j?y the infusion of this bark. 



These phaenomena seem to announce that this bark is not 

 a true cinchona, or, if it does belong to this class of ve- 

 getables, that it has none of their chemical properttcs : from 

 this we may presume that it does not possess the same me- 

 dicinal virtues, because it has neither the bitterness nor the 

 astringency proper to all cinchonas in a greater or less de- 

 gree : if we add to this, that it docs not precipitate either 

 glue, emetic, or infusion of tan, properties which belong 

 to the best species of cinchona, we may be almost certain 

 that it is not a febrifuge. 



Eighth Species. — Yelloiv Clnchojia. {Cinchona piihescens 

 oflVaUi*.) 



100 grammes of this cinchona in fine powder, macerated 

 for 24 hours in distilled water, yielded a transparent liquor of 

 a golden-yellow colour, very bitter, and becoming frothv on 

 agitation. Tried by the ve-agents, this liquor presented the 

 following effects : 



Gallated alcohol formed an abundant precipitate, which 

 an excess of this alcohol redissolved, and which the addition 

 of water reproduced : this proves that it is not a purely animal 

 matter which the tannin separates from it. 



It precipitates the solutions of emetic and of nitrate of 

 mjercury in yellowish-white, and causes a solution of sul- 

 phate of iron to assmnc a very decided green cojour^ without 

 precipitating any thjng from it. 



Solution of size effects no change on it : it does not 

 redden turnsole tincture. During the evaporation, this li- 



* The physical description of this cinchona has been madp by Walh aiyl 

 j^her medical botanists. 



quor 



