The Materia Medica of the Hindus, compiled from Sanskrit Medical Works c4.s6.59

c4.s6.59

For external application, about a drachm of mercury is recommended to be rubbed between the palms with the juice of the leaves of Sida cordifolia (bátyálaka) till the globules of mercury are no longer visible. The palms are then to be warmed over the fire till perspiration breaks out from them.²