Spanish Fly, usually called by the plural name of cantha-rides, but properly speaking, is a chafer of a shining green colour, a blueish shade, and emitting an unpleasant narcotic odour. This insect is the Meloe vesicatorious, L,. which preys on the leaves of the common lilac, Syringa vulgaris, L. privet, Ligustrum vulgare, L. common ash, Fraxinus excelsior, L. and other trees, though it seldom appears in our climate. - Having already stated various substitutes for this foreign drug, under the head of Blister, and cautioned the reader against its indiscriminate application, we shall only add, that the internal use of this medicine, even in very small doses, is extremely precarious, and ought, therefore, to be abandoned. - Ex-ternally, the tincture of Spanish fly lias often been employed with advantage as a rubefacient, by merely rubbing indolent swellings ; or, the powder, as an ingredient in plasters, which ought, however, to contain but a very small portion of this powerful stimulant.