Letter, from Antoni van Leeuwenhoek to Hans Sloane, dated at Delft Signed autograph Gives thanks for sending issues of 'Philosophical Transactions' and a book on mines in Peru Covering letter for EL/L3/54 Transcribed and translated in 'Alle de brieven van Antoni van Leeuwenhoek', edited, illustrated and annotated by Committee of Dutch Scientists, vol 14, p 247 3 November 1703