948 Wisconsin Academy of Sciences , Arts, and Letters. 
faucet I, when in position a , through tube 4, into the percolator, 
the substance to be extracted. A is the condenser. 
B, penetrate the substance to be extracted, and condense. The 
percolate passes into the receiver and from this flows through 
the tri-faucet III in its position a, through the tube 7, again 
into the still, to repeat this course as long as it may be desir¬ 
able. To prevent pressure in the apparatus, the tube 2, is 
removed during this operation, and the tri-faucet II is placed 
in position a . This admits the vapor into the cooling worm, A, 
which thus forms a safety valve. 
2) For the continuous extraction with cooled solvents, the 
vapors pass from the still C, into tube 1, and enter through the 
tri-faucet I, in its position h, through tube 2, into the cooling 
worm A, from this as a liquid through the tri-faucet II, in its 
position a, into the percolator, and so through the substance to 
be extracted into the still as before. 
3) For the recovery of the solvent from the extract by direct 
distillation, the vapors pass from the still C, through tube 1, 
through the tri-faucet I, in its position &, through tube 2, into 
the cooler, A, through the tri-faucet II in its position b, into the 
exit tube 3, which latter may be lengthened at pleasure. 
Portions of the percolator may be removed from the receiver 
at pleasure through the tri-faucet III, in its position c, by the 
tubes 2 and 3. All of the tubes are connected or disconnected 
by good screw joints. 
Flueckiger, F. A. 1889 
Ein zweckmaessiger Extraktionsapparat. 
Arch. d. Pharm., 227, p. 162. [Proc. Am. Pharm. Assoc., 37, 
p. 338.] 
The extraction tube A is provided at C with a diaphgram 
from the center of which a small tube or neck extends into the 
funnel D. The tube B F attached to the side, passes into 
a tubulure G, which is provided with an ordinary cork K 
by means of which communication through the tube B F, 
between the upper, and the lower portions of the apparatus 
may be cut off or established. Thus causing the condensed 
liquid to return through the drug when the communication is 
closed or allowing the liquid to be distilled off when it is open. 
