A letter to Mr. Clare, surgeon, on his new and easy method of introducing mercury into the system, through the orifices of the absorbent vessels, on the inside of the mouth: By Wm. Turnbull, late Surgeon of His Majesty's Royal Navy. Also remarks on the same subject, by Wm. Turnbull, M.D And Recommending it to the Consideration of the World in general, and the Navy in particular