The Royal Society read the first part of Letter L-150 about the brain of several animals, chalk stones of gout, leprosy, and scales of eels

December 13, 1684

Birch, History, vol. IV, p. 340, 3 December 1684 (O.S.) in London:

Part of a letter of Mr. LEWENHOECK, dated at Delft, July 25, 1684, was read, concerning the parts of the brain of several animals, the chalk stones of the gout, the leprosy, and the scales of eels. The latter part of this letter was reserved for the next meeting.