M. C. Lea on Picric Acid. ' 381 
poured over it, and as as the action commences, twenty-five 
ounces of water (hot is preferable but not essential), which must 
the action is very sudden, is intro- 
By degrees the mass subsides, : 
and continued till the bulk of the mixture is uced to one-half, 
; i en 
this. 
‘the is reduced to 
bulk of four or five fluid ounces. After cooling this will : 
found to have become a cake of picric acid more or less solid in 
Proportion to the point to which the final evaporation has been 
Fa tes BE 
i ret 
