Letter, from Antoni van Leeuwenhoek to the Royal Society, dated at Delft Signed autograph Concerning the muscle fibres of whales; observations of the crystalline humour of the eye of a whale; observations of the eyes of cod, whiting; theory why fish do not have eyelids Read to the Royal Society on 12 July 1704 6 red-chalk figures attached English translation is EL/L3/65 Transcribed and translated in 'Alle de brieven van Antoni van Leeuwenhoek', edited, illustrated and annotated by Committee of Dutch Scientists, vol 15, p 3 English translation printed in 'Philosophical Transactions', vol 24, no 293, p 1723 22 July 1704