Scarifiers were traditionally used for blood letting, and in folk medicine for the practice of cupping. Spring loaded knives cut the skin, then a warmed metal or glass cup is placed over the cuts. As the air inside the cup cools, it creates a vacuum drawing out the "bad" blood. The process is also related to the ancient medical theory of "humors". This theory dates back to the Hippocratic tradition and persisted through to the mid-19th Century. According to this theory, the body had four "humors", "airs" or "elements" which neeed to be kept in balance. Any imbalance could cause illness and this was often explained in terms of excess fluids. One prescribed treatment was to remove the excess blood which would restore the balance.Square, solid brass object with lever to release blades underneath.Etched on side: Mundy / Londonmetal, blades, bloodletting

Small retractable steel blade with pointed tip protected by pair of tortoiseshell covers; blade marked with maker's name.MCNvolum collection, lancet, blade, knife, vaccination, cutting, bleeding, bloodletting, thumb lancet