British Library MS. Add. 25424. Paper. Folio. 18th Century. Catalogue of the Library of Sir Isaac Newton. At the end are two receipts from Thomas Pilkington and Catherine Conduitt, neice of Sir Isaac Newton, administrators of his estate, to John Huggins, for the purchase money of the whole library, with the exception of six books containing Mss notes; 2 June and 20 July, 1727.