British Library MS. Sloane 3840. Paper. Folio. 131 folios. 18th Century. ['Vera Philosophia': consisting of extracts from numerous Alchemical authors made by J.C.I. Hamburgensis, 1710-1716. Among the writers and works quoted are Nicolas Flamel, Hermes Trismegistus, Paracelsus, Cornelius van Drebbel, Samuel Norton, Arnold de Villa Nova, The Marrow of Alchemy [by Eirenaeus Philoponus Philalethes, printed London, 1654-5, octavo. In German and English].