By an analysis of extensive and detailed annotations in copies of Thomas Johnson's Mercurius botanicus (1634) and Mercurii botanici, pars altera (1641) held in the library of the Royal Botanic Gardens, Kew, the probable author is identified as William Bincks, an apprentice apothecary of Kingston-upon-Thames, Surrey. Through Elias Ashmole, a friend of Bincks' master Thomas Agar, a link is established with the probable original owner, John Watlington of Reading, botanist and apothecary, and colleague of Thomas Johnson. The route by which the book ended up in the hands of Thomas Wilson, a journeyman copyist of Leeds, is suggested. Plants growing near Kingston-upon-Thames in the late seventeenth century, recorded in manuscript, are noted, many being first records for the county of Surrey.