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You may remember, that in my letter of the 25th ofDecemb . 1702. I affirm’d that the animalcula, represented by Fig. 8. a. b. c. that were fastned to the small roots of that green stuff found on the top of the water, in our ditches and little canals, which we call duck-weeds, had two small wheels, issuing out of their bodies.

I. A letter to the Royal Society, from Mr. Anthony Van Leeuwenhoek, F. R. S. concerning animalcula on the roots of duck-weed, &c