116 REMARKS ON OLEO-RESINOUS ETHEREAL EXTRACTS. 
preciseiy in the manner that the so-called oil of black pep- 
per is used, which is an analagous preparation. For exter- 
nal use, as a rubefacient either per se, or admixed with 
other substances, it would present several advantages. 
The ethereal extracts of chenopodium and semen contra, 
are undoubtedly worthy of attention ; they have a semi- 
fluid butyraceous consistence consisting of volatile oil, resin, 
and chlorophylle, and that of semen contra contains santa- 
nin also. 
The ethereal extract of ginger is already known in French 
Pharmacy under the name of piperoid of ginger, and was 
proposed by M. Beral as the basis of several preparations 
of the drug. 
The ethereal extract of cardamom seeds is well deserving 
of attention. These seeds contain about 10 per cent of a 
fluid fixed oil, and 4.6 per cent of volatile oil, the latter being 
the desirable portion. The pure volatile oil soon changes by 
exposure to the air, and loses its fragrance; but when 
mixed with the fixed oil it is much more permanent, and 
may be applied in various ways as an aromatic, to powders, 
to emulsions, and probably would afford a good substitute 
for the powdered cardamom (which is rarely sufficiently 
fine.) for introduction into the extract of colocynth. 
The ethereal extract of pellatory (Anthemis pyrethrum) 
is semi-fluid, or almost fluid, and possesses the curative pro- 
perties of the drug in a very condensed form. It is an ad- 
mirable application for paralyzing or numbing the dental 
nerves in decayed teeth — and is more manageable than the 
alcoholic extract, which has been used in this city. 
With the permission of the publishers, I have annexed 
hereto, the description of an apparatus for extracting 
with ether, suggested by Dr. Mohr, one of the authors of 
Mohr & Redwood's Practical Pharmacy, from which work 
it is taken. 
"Figs. 11,12, and 13 represent this apparatus, which con- 
sists of a two-necked YVoulf's bottle, (fig. 11, P,) into the cen- 
