2. Blue vitriol 2 oz., white vitriol 1 oz., rubbed down and mixed with lard 2 ., tar 1 ; a pledget of tow covered with it to be introduced into the cleft of the frog every night, and renewed in the morning. - Youatt.
4. Verdigris 1 1/2 oz. (or burnt alum 8 oz.), red lead 8 oz., treacle 4 ; boil to a proper consistence, and add 1 oz. of nitrons acid. - Feron.
6. In Canker. Tar 4 parts, nitric acid 1 part; mix. - Morton.