Chemical nomenclature of the present day has gone to the opposite extreme. The ingenious laboratory devisers of synthetic products have developed a nomenclature which it is impossible to use. It explains itself to the initiated, but even for intercommunication between chemists, pharmacists, and physicians words like tetrahydroparamethyloxyquinoline or calcium betanaphthol-alphamonosulphonate insist on being simplified if the substances they describe come into medicinal use; and to do them justice it must be admitted that the inventors of the products are always ready to meet this requirement with a more or less expressive title which can be protected as a trade mark. This forces other manufacturers to devise other distinct names for the same article, so that among the new chemicals which have become popular within the past thirty years there are sometimes a dozen designations for the same substance. A PHARMACEUTICAL VOCABULARY. The subjoined list of technical terms is limited to the names of pharmaceutical processes, products, and apparatus; and only (as a rule, with some exceptions) of such as are not dealt with in other sections. Many of the terms are obsolete, but are to be met with in old treatises. Occasionally rather more than a bare definition has been thought desirable. * * * * * Acetabulum. Originally a vessel used by the Romans for holding vinegar at the table. Then a liquid measure about 2½ oz. Acetum Philosophicum. Vinegar made from honey. Acopon. A stimulating or anodyne liniment, almost of the consistence of an ointment. If acopa contained aromatics they were called myracopa. Adept. An alchemist who “had attained.” Adust. A dried up condition of the humours. Aggregatives. Pills devised by Mesué which were intended to purge all the humours. Alabaster. A special kind of carbonate or sulphate of lime used by the ancients for ointment containers which were sometimes called alabastra. The name is supposed to have been derived from a town in Egypt. Album Rhasis. White lead ointment, which Rhazes was believed to have introduced. Alembic. The Arabic name for a still. It was adapted by the Arabs from the Greek ambix, a vase, to which was prefixed the particle al. The word became corrupted in English to Limbeck. Alembroth. Sal Alembroth was the double chloride of mercury and ammonium. Also called the salt of wisdom. The word has not been traced, but has been supposed to be a Chaldaic term meaning the key of art. Alexipharmic (in Greek alexipharmakon). A remedy against poison. Alexiteria. Remedies against the bites of venomous animals. Alhandal. The Arabic name for colocynth which was applied to certain lozenges or tablets of that drug.