"In Leiden, the Uffenbach brothers are visiting Bernard. They were expecting connoisseurship of books and instruments, because Bernard was writing the Nouvelles de la république des lettres and was considered a good mathematician. Uffenbach is disappointed in his knowledge. Bernard claims to have a good friendship with Huygens. The day after they visit candidat.medic. Stosch, whose brother they had met in The Hague. This Stosch is a connoisseur of plants."