Oxford, Bodleian Library MS. Eng. misc. e.473. iii+ 94 folios. Fair copy of a 17th Century treatise on alchemy by Eireneaeus Philalethes, entitled 'The entrance opend into the hidden palace of the king', differing considerably from the version published as Secrets reveal'd (London, 1699). A shortened latin translation was published as Intoitus apertus ad occlusum regis palatium (Amsterdam, 1677).