Elm Tree, called Ubnin, 6g 



This English ulmin made a considerable effervescence with 

 acetous acid, which the Palermo ulmin had not been observed 

 to do. This acetous solution, in which the acid was in excess, 

 was exhaled dry, and repeatedly washed with spirit of wine. 

 No part of the brown matter dissolved. Water dissolved this 

 brown residuum readily and entirely. This solution did not 

 sensibly restore the blue colour of reddened turnsol paper. 

 Exhaled to a dry state, the matter left did not separate from 

 the watch-glass quite as freely as Palermo ulmin, which had 

 been treated with acetous acid ; but it seemed no longer to 

 grow moist in the air. Redissolved in water, and nitric acid 

 added, the mixture became thick from a copious precipitate. 



The spirit of wine contained a quantity of acetate of potash. 



The excess of alkah, in this English ulmin, may be owing to 

 the tree from which it was collected having been affected with 

 the disease, which produces the alkaline ulcer to which the 

 elm is subject. 



Sap of the Ehn Tree, 



Thinking that the production of ulmin by the plant might 

 not be the consequence of disease, and that it might exist in 

 the healthy sap, a bit of elm twig, gathered in the beginning 

 of last July, was cut into thin slices and boiled in water. It 

 afforded a brown solution, like a solution of ulmin. Exhaled 

 to dryness, this solution left a dark brown substance, in ap- 

 pearance similar to ulmin, but on adding water to this dry 

 mass, a large quantity of brown glutinous matter remained 

 insoluble. The mixture being thrown on a filter, a clear yel- 

 low liquor passed, which may have contained ulmin, but the 

 quantity was too small to admit of sadsfaciory conclusions. 



