EUPATORIUM PERFOLIATUM. 35 



ter it was evaporated, a crystalline mass was 

 obtained, upon which sulphuric acid was pour- 

 ed. Fumes like aromatic vinegar arose. 



EXP miMENT XXI. 



To the flowers, leaves, and roots that were 

 employed in experiment the eighteenth, a 

 quantity of very pure alcohol was added : 

 they were suffered to infuse for twenty-four 

 hours, and the infusion then decanted. The 

 appearance of the alcoholic infusion of the 

 flowers was of the colour of Madeira wine, 

 and possessed a bitter taste and an aromatic 

 flavour. With the infusion of litmus, it form- 

 ed a red colour ; a solution of sulphate of iron 

 produced a dark green ; barytic water formed 

 a brownish yellow ; nitrate of lead created a 

 slight precipitate; with the acetate of lead it 

 caused a brown precipitate ; carbonate of pot- 

 ash formed a slight brown precipitate; tar- 

 tarised antimony and gelatin had no effect 

 upon it ; distilled water formed a precipitate. 



