various Species of Cinchona. 4f 



warm water, which acquired a deep enough colour; it was 

 less bitter than the water of maceration, and it was still more 

 mucilaginous than the decoction of cinchona pubescens. 



It precipitated gall-nuts and nitrate of mercury, and greened 

 the sulphate of iron; but neither emetic nor glue produced 

 any change upon it. This species, therefore, is not the same 

 as that which has been above examined under the name of 

 gray cinchona, called superior. 



Tenth Species. — Cinchona magnifolia. 



100 grammes of this bark, reduced into a fine powder, 

 and macerated for 24 hours, yielded a solution which 

 passed through the filter with difficulty ; it was of a ruby red, 

 little mucilaginous, of a slight bitterness, and a very decided 

 stringency. 



The tincture of turnsole was not reddened by this solu- 

 tion ; neither gall-nuts nor emetic formed any precipitate 

 in it ; the solution of glue precipitated it abundantly ; the 

 sulphate of iron made it assume the green colour of oxide 

 of chrome, which the oxymuriatic acid turned into a dirty 



green. 



It also precipitated the maceration of cinchona pubescens 

 and of cinchona officinalis. 



It is necessary to remark, that the second washing of this 

 cinchona, made with cold water, did not precipitate glue. 



The macerated aqueous extracts of this cinchona, evapo- 

 rated to the consistence of extract, while still hot were treated 

 with alcohol, which acquired a very fine colour. This al- 

 coholic solution, diluted with water, and tried by the re- 

 agents which had been made use of for the first macerated 

 extracts, presented the same results. Thus the matter which 

 produced the cflccts above announced is soluble in alcohol. 



The part not soluble in alcohol was of an ochre red, 

 which was blackened by the air ; it was redissolved in water ; 

 its solution would neither precipitate glue nor gall-nuts, but 

 it precipitated emetic and nitrate of mercury, and turned 

 sulphate of iron green. 



Ten graninus of this substance, insoluble in alcohol, being 



distilled. 



