Extract of Pel′litory

Syn. Extractum pyrethri , E. p. æthero-alcohol i cum , L. Prep. (W. Procter.) Alcohol (rectified spirit), 1 pint; ether, 1 ⁄ 2 pint; mix, and pour it gradually on root of pellitory ( An a cyclus Pyrethrum ), 1 lb., placed in a percolator; afterwards pour on alcohol, 1 pint; and subsequently sufficient dilute alcohol (proof spirit) to displace 2 1 ⁄ 2 pints of tincture ( ESSENCE OF PELLITORY , TOOTHACHE ESSENCE ); the latter is either suffered to evaporate spontaneously, or by a very gentle heat, until a soft extract is attained. Used to destroy the sensibility of the nerves of the teeth, previous to plugging, and for toothache.