What has been said fairly well exhausted the available information on Thomas Vaughan until a few years ago, when Mr. A. E. Waite discovered in Sloane MS. 1741 a valuable manuscript of his, containing amongst other things a number of autobiographical memoranda. He printed some extracts from this in the preface to an edition of some of _The Magical Writings of Thomas Vaughan_ (Redway, 1888), and has been kind enough to furnish me with a reference to the MS. itself, which I have carefully examined. It bears the title _Aqua Vitae non Vitis_, and the inscription "Ex libris Thomas et Rebecca Vaughan, 1651, Sept. 28. Quos Deus coniunxit quis separabit?" The contents are partly personal jottings and records of dreams, partly alchemical formulae. They appear to cover the period 1658-1662. We learn from them the following facts:--Vaughan was married on September 28, 1651, to a lady named Rebecca (f. 106 (b)). With her and his "Sister Vaughan" he lived and studied alchemy at the Pinner of Wakefield.[21] He had previously lodged at Mr. Coalman's in Holborn (f. 104 (b)). His wife died on Saturday, April 17, 1658, and was buried at Mappersall, in Bedfordshire (f. 106 (b)).[22] In 1658 his father and his brother W. were both dead, and he mentions the news of his father's death coming to his niece in a letter from the country (f. 89 (b)). On April 9, 1659, he saw his brother H. in a dream. On 16 July, 1658, he was living at Wapping (f. 103 (b)), and at an earlier period at Paddington. There is an inventory of his wife's goods left at Mrs. Highgate's, and mention of a Mr. Highgate and a Sir John Underhill (f. 107). He names his cousin, Mr. J. Walbeoffe, with whom he had some money transactions (f. 18), and speaks of "a certain person with whom I had in former times revelled away my years in drinking" (f. 103). Perhaps this also was John Walbeoffe, on whom _see_ vol. ii., p. 189, _note_. The alchemical formulae and receipts are interesting. In one place (f. 12) Vaughan announces the discovery of the "Extract of Oil of Halcaly," which he had previously found in his wife's days and had lost again. This he calls "the greatest joy I can ever have in this world after her death." He seems to have regarded it as the key to an universal solvent. Nearly every receipt is followed by his and his wife's initials in the form T. R. V. or T. ^V. R., and by some expression of devotion to her or of religious piety.