from "Le ciel" by A. Berget (1923).
Jean Felix Picard (21/7/1620-1682) seems a probable candidate for this man of the
cloth. As there are only three clergymen mentioned as founding members
(Picard, Mariotte and Du Hamel) and Duhamel is identified as the man in
front, it is only by exclusion and a certain likeness to the portrait shown above,
that I come to this identification. Again the age (46) seems about right
for this man.
As I learned on 29 May 2013 the above picture is not a portrait of Jean Felix Picard
but of Johan Andreas Piccart (2/6/1620-17/4/1666)