In parasitic cases, such as ringworm and scabies, the sulphate of copper has been applied with success: in the former Dr. Graves recommended a wash containing 10 gr. in the ounce, a strength which may, with advantage, be doubled: an ointment containing a similar proportion mixed with lard has cured scabies (Lancet, i., 1846). In ichthyosis, this ointment has also been recommended by Mr. E. Wilson, and the solid crystal is often used for verruca (wart) and molluscum.