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Related article:
47
trated by the accompanying cuts (Figs. 3 1 and 32). The flask {a Fig. 32 )
contains the ether, or other immiscible volatile solvent, the vapor of which
passes through the tube (c) into the extraction apparatus (^) and thence
reaches the condenser (^/). Here it is condensed and drops into the cup
(^), from which it flows through the small hole ((A) into the hollow
spindle (e, Buy Elavil e \ of the stirrer and is ejected through openings in the hollow
rings (k and /) at the bottom of the apparatus into Buy Elavil the liquid to be ex-
tracted. The spindle (e) being revolved rapidly on its axis by the pulley
(/), the solvent is mixed in a finely-divided state with the liquid to be
Fig. 32.
Apparatus for Extraction of Liquids.
extracted, and when sufficiently accumulated flows back into the flask
through the tube (r), whence it again returns as vapor until the extraction
is completed. Obviously, a number of these apparatus can be arranged
side by side and several operations conveniently conducted at the same
time. Pharm. Ztg., liv (1909), No. 64, 622.
Extraction with Immiscible Solvents, Convenient Apparatus, Her-
mann Erode describes the simple apparatus shown by Fig. t^i which per-
mits the automatic extraction Buy Elavil of specifically heavier liquids with small
quantities of specifically lighter immiscible solvents. An ordinary cylin-
drical separatory funnel is provided with an S tube, ( C and C), which may
be attached by means of rubber-tubing and held in place by means of
Digitized by
Google
48
REPORT ON THE PROGRESS OF PHARMACY.
wire. The stop cock (d) being closed, a quantity of the immiscible sol-
vent is introduced into the funnel and the heavier liquid to be extracted
is allowed to drop in slowly in the smallest possible drops the flow being
regulated Buy Elavil by means of a scyew-clamp at (//), observing that the point of
the pipette-tube ^ just dips beneath the extracting solvent. When the
heavier liquid has accumulated sufficiently to fill the S tube (c c') the stop
cock (^) is opened and the extracted liquid will then flow out at c as fast
as it drops into the separatory through e. If devisable the liquid from c
may be dropped into a second extraction apparatus charged with the same
solvent, and this with a third, so as to secure complete extraction. But
in any case, the apparatus and method secures the extraction of small
Fig. 33.
Extracting with Immiscible Solvents.
quantities of substances from large quantities of specifically heavier liquids
with the smallest possible quantity of the lighter immiscible solvent.
Apoth. Ztg. xxiv. ( 1909), No. 72, 663.
Maceration and Percolation History and Comparative Value, Otto
Raubenheimer has contributed an exceedingly interesting historical ac-
count and criticism on the comparative value of the processes of macera-
tion and percolation for the extraction of drugs which must be consulted
in the original to be fully appreciated. In his conclusion Mr. Rauben-
heimer says that in his experience the percolation process, and especially
the improved macero- percolation method of the U. S. P., VIII, although
the same cannot be used for the exhaustion of all drugs, decreases the
Digitized by VjOOQ IC
DUNSTAN Buy Elavil AND SHORT'S EXTRACTION APPARATUS.
49
Fig. 34.
labor and saves time and is a scientific method par excellence. When
properly carried on all the advantages of maceration are obtained, and
furthermore it is superior to maceration, inasmuch as no strong menstruum
is retained in the marc. Amer. Joum. Pharm., Jan., 1910, 32-42.
Maceration and Percolation Historical Review, At the monthly meet-
ing of the Kings County Pharmaceutical Society, Feb. 8, 19 10, Thomas J.
Keenan presented a highly interesting contribution to the study of mace-
ration and percolation, in which he traces the history of percolation from
the time when, during the early part of the
eighteenth century, Buy Elavil Edward Lloyd, a coffee- Fig- 35-
house keeper in Abechurch Buy Elavil Lane, London,
made his coffee by percolation, to the most
recent utterances on the subject of drug
extraction, incited by the prophetic words
of Professor Tschirch, the eminent Swiss
pharmacognocist, that he could foresee a time
when medicine having thoroughly ruined its
digestion with synthetical remedies, and
tested all the organs of the animal body, " it
(medicine) would return once more to the
most ancient remedies of mankind to the
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