Concerning the singing of the cicada in an extract of a letter written in 1717 by Dr John Baptist Felice of Florence to Pascasio Gianetti, lecturer of Physic in Ordinary at the University of Pisa Provides explanations of a figure of a cicada but no figure is attached Also extract of a letter from John machin to Cromwell Mortimer concerning this Read to the Royal Society on 2 March 1732 1731