London, Printed by J. Nourse for Bryan Robinson, 1767. Hardback fourth edition. 11 Fold-out plates. [x] 404  p. Final leaf of adverts. Collation matches copy held at Oxford. Some rubbing to boards, top of upper hinge has slight split. Front free endpaper worn and torn and barely hanging on. Armorial bookplate to front pastedown. Wormhole starting from the rear (as in bookworm, not timespace anomaly - at least we assume this to be the case). Richard Helsham was best known as the personal doctor of Jonathan Swift. Bryan Robinson was one of Helsham's pupils and published the book after Helsham's death, adding the preface.