402 John CASE [fl. 1680-1700]. The Wards of the Key to Helmont Proved Unfit for the Lock; or, the Principles of Mr. William Bacon Examined and Refuted, and the Honour and Value of True Chymistry Asserted. By John Case, Student in Physick and Astrology 4° London: Printed for the Author; and are to be sold by John Smith 1682 Nat Union Cat British Library [Illustrations:- 1. p8 Woodcut. 45x63mm. Set of scales balancing 'heat' and 'cold'. 2. p9 Woodcut. 50x63mm. Set of scales unbalanced, with the rightmost pan containing 'cold' weighing the heaviest.]