British Library MS. Sloane 3579. Vellum. In Octavo. 50 folios. 16th Century. 1. A few rules and principles in the science of Alchemy. f.1. 2. A treatise by G. Ripley, entitled 'Liber de lapide animali': a portion of a larger alchemical work; apparently translated from the Latin original. ff.3-16. Begins: 'Ad dei laudem et ejus honorem omnia semper fiant. Amen. Et igitur in nomine patris et filii et Spiritus Sancti hic incipit liber de lapide animali; Without help of which stone the mynerall stone ne every other stone'. 3. A treatise of the Philosophers' Stone. ff.17-40. Begins: 'This precious tresour may be founde by grace and kennying and a right light'. 4. A treatise of the mineral stone; a portion of the same work as the Liber de lapide animali, described in art 2. ff.41-49. Begins: 'Nowe here, accordyng to my promesse folowyth the werking of the minerall stone'.