This section is from the book "Materia Medica And Therapeutics Inorganic Substances", by Charles D. F. Phillips. Also available from Amazon: Materia medica and therapeutics.
Charcoal "pegs" have been used as a cautery; they are mixed with nitrate of potash (Lancet, ii., 1866, 309).
Therapeutical Action (Internal). For ordinary medicinal use, wood charcoal is commonly preferred.