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 time. He uses the word Linamentum for a sort of lint. Acopa were a kind of liniment.

Enema or clyster or glyster are all used to signify either the injection or the instrument by which the injection is applied. Enema (properly pronounced with the accent on the first syllable) means something sent; clyster was the Greek word for the instrument.

Ens. A favourite term with old metaphysicians and alchemists with the same meaning as essence. Supposed to have been derived from Esse, to be.

Epithema. An alcoholic fomentation or liquid medicine applied to the heart and stomach as a stupe.

Epithemation was the name of an application described by Galen as of a consistence between that of a cerate and that of a plaster.

Errhines, called Nasalia in Latin, are substances snuffed up the nostrils to excite sneezing.

Gas was a word invented by Van Helmont. Several guesses have been hazarded as to the idea which suggested the term. The Dutch geest, spirit or ghost, seemed the most likely. The German gäschen, to ferment, has also been proposed. But in 1897 Dr. F. Hurder discovered a paragraph in Van Helmont's writings which stated definitely that he had derived the word from chaos.

Gilla Vitriola. The name first given to white vitriol. Gilla meant simply salt.

Gutteta. A term for epilepsy. Pulvis de Gutteta was a remedy against epilepsy.

Hepars were chemicals of a liver colour, as hepar antimonii, hepar sulphuris.

Infusions first appeared in the London Pharmacopœia of 1720. In the revised edition of that issue (1724),