Translation of a letter, from Antoni van Leeuwenhoek to the Royal Society 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 Translation of EL/L3/3 Extract in 'Philosophical Transactions', vol 19, no 235, p 790 1697