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Thomas Willis, M.D. 1621-1675.
in "Pharmacologia Anti-Empirica" (1683), writes:—"The best preparation of any that iron can yield us is a secret of Dr. Willis. It has hitherto been a great secret and sold at a great price. It was known as Dr. Willis's Preparation of Steel." Dr. Harris thinks it will not be an unacceptable service to the public to communicate this masterpiece of that eminent and ever famous man. "It was no strained stately magistery, no sublimation or salification, no calcined crocus, and no chemical mystery; but an easy and a natural way of opening this hard body that it may open ours." It was given particularly for the removal of obstructions. The formula was equal parts of iron filings and crude tartar powdered and mixed with water in a damp mass in a glazed earthen vessel. This was to be dried over a slow fire or in the sun; wetted and dried again; and this
