22 DISSERTATION ON THE 



EXPERIMENT III. 



The deGoction of the root subjected to ex- 

 perimeDt produced the following results : An 

 infusion of litmus induced a red colour ; a so- 

 lution of the sulphate of iron changed it to a 

 green, but not so dark as in the two last expe- 

 riments ; an infusion of galls, like that prepared 

 from the leaves, caused no precipitate ; with 

 muriate of tin, a copious precipitate was form- 

 ed y nitrate of mercury formed a copious white 

 precipitate ; oxalate of ammonia formed a tur- 

 bidness ; pure potash produced a brownish 

 green colour, and in both these respects was 

 similar to those obtained from the flowers. 

 With gelatin no precipitate was evident ; ni- 

 trate of silver caused a copious whitish pre- 

 cipitate, similar to that produced from the de- 

 coction of the leaves; acetate of lead formed 

 a slight greenish precipitate ; nitrate of lead 

 induced quite a copious precipitate : with the 

 muriate of barytes, sulphuric acid, tartarised 

 antimony, pure ammonia, chromic acid, carbo- 



