Letter, from Antoni van Leeuwenhoek to the Royal Society, dated at Delft Signed autograph Observations of small white eggs mixed with earth; observations of a pulmonary vein in an egg which was pulsating; observations of Roman snails; observations of the rootlets of a wheat grain; further observations of a tooth which Leeuwenhoek extracted from himself; observations of young oysters Read to the Royal Society on 22 December 1697 English translation EL/L3/4 Transcribed in JBO/10/56 Transcribed and translated in 'Alle de brieven van Antoni van Leeuwenhoek', edited, illustrated and annotated by Committee of Dutch Scientists, vol 12, p 179 Translated extract in 'Philosophical Transactions', vol 19, no 235, p 790 10 September 1697