EUPATORIUM PERFOLIATUM. 23 



nate of potash, appearances and precipitates 

 were produced nearly in every respect the 

 same as those related in experiments the first 

 and second. 



EXPERIMENT IV. 



A decoction of the flowers prepared as in 

 the former experiments, was evaporated to 

 the consistence of syrup. A portion of very 

 pure alcohol was poured upon it, and after 

 infusing twenty-four hours, was poured off. 

 Fresh alcohol was then added, and this was 

 suffered to stand for twenty-four hours, and 

 again decanted. This process was repeated, 

 until the alcohol exhibited no change of co- 

 lour whatever. After all the alcohol had 

 been decanted and mixed, it appeared of a 

 brown colour, and had a bitter taste. It pro- 

 duced the following results : with an infusion 

 of litmus, it formed a red colour ; with acetate 

 of lead a light green ; no precipitate was 

 caused by tartarised antimony ; barytic water 

 formed a light yellow ; with sulphate of iron 



