Wrote Letter L-464 of 1708-06-29 to the members of the Royal Society about his further observations of the white furry substance on his own tongue during attacks of fever
Date:
June 29, 1708
The original manuscript on six quarto pages, written and signed by Leeuwenhoek, is preserved at the Royal Society (MS. 2071. L 4. 20).
In 1932, Dobell published his translation of the paragraphs on oral bacteria. (pp. 254-255)