936 Wisconsin Academy of Sciences , Arts, and Letters. 
supported on a tripod. At D and D are two false bottoms be¬ 
tween which the material to be extracted is packed. Into the 
cover of the apparatus, the pipe B, which may be 50 to 60 feet 
high, is fitted. The communication between B and A may be 
stopped by means of the stop cock C. The dish E under the 
tripod receives the percolate. 
Fig. 2.) The second figure is a modification of the first do¬ 
ing away with the long tube. The solvent is admitted to the 
space X by pouring it into the funnel E. The percolate is 
collected in the container G-. The pressure is secured by filling 
the cast iron container A with mercury. After the apparatus 
C is charged with drug and solvent, the stop-cock H is closed 
and the pipe B also filled with mercury which then forces the 
menstruum through the firmly packed drug. 
Buchner, J. A. 1819 
Beschreibung und Abbildung der von Herrn Dr. Romers- 
hausen erfundenen Luft-presse. 
Repert. der Pharm., 6, p. 316. 
V/ 
Z 
