ETJPATORIUM PERFOLIATUM. 41 



subsequent experiment, we found it in an 

 alcoliolic solution, it is probably united with 

 acetic acid. The sulpliuric acid proved the 

 presence of extract. The effect of the alka- 

 lies proves the presence of extract. The 

 tannin principle was proved by the gelatin. 

 The precipitate formed by the nitrate of sil- 

 ver was ow^inof to extract. The changes pro- 

 duced by chromic acid, and the olive green 

 precipitate formed, may probably be account- 

 ed for by the deoxidation of the acid itself, 

 from the action of extract. The acetate and 

 nitrate of lead also afforded tannin and extract. 

 Tannin was also made evident by the action of 

 the carbonate of potash. 



From experiments second and third, it was 

 ascertained, that the extractive matter is in 

 less quantity in the leaves than in the flowers, 

 and that it may be obtained abundantly from 

 the roots. More of lime was proved to exist 

 in the leaves, than in either the flowers or 

 roots. Judging from the precipitate formed 

 by pure alkali, there would seem to be little 



