Mignet was well known in fashionable circles where his witty conversation and pleasant manners made him a favourite. Most of his time was devoted to study and to his academic duties. Eulogies on his deceased fellow-members, the Academy reports on its work, and on the prizes awarded by it, which it was part of Mignet's duty as secretary to draw up, were thoroughly appreciated by connoisseurs, and were collected in Mignet's Notices et portraits.