This section is from the book "A Treatise On Therapeutics, And Pharmacology Or Materia Medica Vol2", by George B. Wood. Also available from Amazon: Part 1 and Part 2.
A considerable number of substances, of a terebinthinate character, are used as external irritants or alteratives, which can be considered in no place more conveniently than the present. They have all or nearly all been noticed elsewhere, in reference to their effects on the system.