Royal Society again postponed reading of Letter L-085 of 1679-05-20 to Huygens

March 28, 1680

Birch, History, vol. IV, p. 29, 18 March 1680 (O.S.) in London:

There were likewise produced some letters of Dr. BEAL, which with the translation of Dr. SWAMMERDAM's description of the insect hemerobius, and the long letter of Mr. LEEWENHOECK, were reserved to the next meeting.