Letter, from Antoni van Leeuwenhoek to the Royal Society Signed autograph Observations of the cochineal (scale insect); observations of cactus glochid Read to the Royal Society on 5 April 1704 11 red-chalk figures attached English translation see EL/L3/63 Transcribed and translated in 'Alle de brieven van Antoni van Leeuwenhoek', edited, illustrated and annotated by Committee of Dutch Scientists, vol 14, p 321 English translation printed in 'Philosophical Transactions', vol 24, no 292, p 1614 21 March 1704