July 10, 1820, he was present and made a report relative to madrepores and molluscs.

In the summer of 1821 he attended several of the meetings.

August 7, 1821, he was present, and referred to the collection of shells of Struthiolaria.
He was present May 23d and June 9th, when it was voted that he should enjoy the garden of the house he occupied and that a chamber should be added to his lodgings.

He was frequent in attendance this year, especially during the summer months.

He attended a few meetings at intervals in 1822, 1823, and only twice in 1824.
At a meeting held April 19, 1825, he was present, and, stating that his condition did not permit him to lecture, asked to have Audouin take his place, as Latreille's health did not allow him to take up the work.