"264 : - RUTACER. 
_ with water. A measured quantity, evaporated, dried and — : 
__-weighed, yielded a small residue equivalent to 8 per cent. of 
the resin. The aqueous extract was slightly acid to litmus, — 
_ precipitated by acetate of lead, darkened by iron salts, but not 
| precipitated by gelatine. It reduced Fehling’s solution. 
The residue from the aqueous extract was dried and exhausted 
with alcohol, in which it was completely soluble. This alcohol 
_ extract allowed to evaporate, yielded a greenish-black 
resin, of bitter taste, and peculiar odour. It was freely 
_ soluble in chloroform, bisulphide of carbon, benzol and 
_ amylic alcohol, less soluble in glacial acetic acid and petroleum 
ether, and almost insoluble in acetic ether. These solutions 
__ allowed to evaporate failed to produce anything crystalline, but 
__leftthe unaltered resin. Treated with sulphuric acid the resin — 
_ gives an emerald green coloration. It is readily oxidized and 4 
attacked by nitric acid, dense red fumes being evolved with — 
considerable frothing, forming a deep red solution, which 
gives a yellow precipitate on pouring into water, soluble in @ 
r portion of hot water with yellow solution. The remainder 
the acid solution evaporated to dryness, and the yellow residue 
neutralized with solution of caustic potash, gives a deep red 
quid, which is precipitated by sulphate of copper and coloured 
sper red by cyanide of potash. It stained the skin, and 
silk and flax a yellow colour, the yellow colour of the. 
ilk being permanent on washing in water. On heating @ 
ortion of the yellow acid residue in a crucible covered with . 
Bb atch glass, a yellow crystalline sublimate was obtained. 
These reactions prove the presence of picric acid. 
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he resin was unaffected by boiling aqueous potash, but : 
ed in alcoholic potash. After digesting a day, thes 
h-yellow powder. Another portion treated 
