Du Mez—The Galenical Oleoresins. 
951 
with a tube as shown in the figure for the purpose of equalizing 
the pressure as the apparatus is closed throughout. 
---- 1908 
Brandel and Kremers, Percolation, p. 52. 
A is an ordinary conical percolator of such a size that it will 
not be more than two-thirds filled with the drug to be extracted. 
B is a round-bottom flask, containing a twice perforated stop¬ 
per, through one hole of which a glass tube connects the flask 
to the percolator. Through the second hole is inserted the 
glass tube C which also passes through the cork stopper in the 
top of the percolator. The end of the condenser D is also in¬ 
serted through this cork. All cork connections should be tightly 
sealed with gelatine. 
The above is the form of apparatus which was used in the 
laboratory in the preparation of the oleoresins when 500 grams 
or more of the drug were extracted. 
