542 
PHARMACEUTICAL MEETING. 
process to two days, to render this period of maceration efficient by supple¬ 
menting it with a process of percolation or displacement, and to make the 
whole operation simple and easy of accomplishment by omitting those parts . 
of the process of percolation which involve difficulty and require skill. 
I have been favourably impressed with the general characters of this process 
from the first, and think we have here the basis of a process admirably well 
adapted for general adoption, involving no difficulties of manipulation, and 
capable of yielding uniform and satisfactory results without unduly taxing the 
attention or the skill of the operator. 
I think, however, that the process as described in the Pharmacopoeia is not 
so complete, simple, and efficient as it is capable of being made, and among 
the objects I have had in view in this communication have been those of sug¬ 
gesting a modification in the Pharmacopoeia process, and of describing a suit¬ 
able form of apparatus for its application. 
The automatic displacement process is the name I propose to give to 
this mode of operating, which, while it practically fulfils the requirements of 
the Pharmacopoeia, comprises the principles of Dr. Burton’s process and of the 
process of displacement. 
1 
Automatic Displacement Apparatus. 
Commencing with the maceration of the solid ingredients in three-fourths 
of the spirit, I propose to effect this by suspending them in the upper part of 
the liquid, and thus to avoid the necessity for agitation. The apparatus I 
have had made for the purpose is a copper vessel, well tinned inside, with a 
round bottom and well-fitting cover. It is furnished with a cock, so fixed that 
the whole of the liquid contents can be drawn off. Near the top of the vessel 
a wire is fixed against the inner surface for the support of the ring (2), to 
which the bag is to be attached, as shown at (3). The bag may be made 
of flannel, or other suitable material. It should be cylindrical, with a round 
