The Royal Society read the latter part of Letter L-186 about the teeth of various animals

May 7, 1687

Birch, History, vol IV, p. 533, 27 April 1687 (O.S.) in London:

The latter part of Mr. LEEWENHOECK's letter of the 4th of April was read wherein he farther prosecuted the inquiry into the make of the teeth of several animals.