A choice collection of rare chymical secrets and experiments in philosophy [Microform] : as also rare and unheard-of medicines menstruums and alkahests : with the true secret of volatilizing the fixt salt of tartar / collected and experimented by the honourable and truly learned Sir Kenelm Digby ; hitherto kept secret since his decease, but now published for the good and benefit of the publick by George Hartman