336 R. Bunsen on the Washing of Precipitates. 
particularly that of the more gelatinous, is so much diminished 
under the high pressure, the precipitate only occupying one- 
third to one-sixth of its bulk under ordinary circumstances, a 
filter of one-third to one-sixth of the size usually employed 
may a taken, and thus the amount of ash proportionately 
essened., 
drai 
