Letter, from Antoni van Leeuwenhoek to the Royal Society Printed copy sent instead of signed autograph Examination of the colours of plumes of the feathers of Leeuwenhoek's green parrot; observations of the colour of wool; metamorphosis of the pigeon flea; the life cycle of a human flea; anatomy of the legs of a flea 20 engraved figures attached Read at Royal Society on 13 December 1693 See EL/L2/45 for covering letter Transcribed and translated in 'Alle de brieven van Antoni van Leeuwenhoek', edited, illustrated and annotated by Committee of Dutch Scientists, vol 9, p 205 15 October 1693