Fonds contains material about the Bradt family. Material concerning the Clark family, including James Clark (clerk of the Legislative Council of Upper Canada from 1793-1806) and his children Jane and James are also included. The Bradt and Clark families were related by marriage. Peter Bradt II married Jane Clark in 1827. The bulk of the fonds consists of written post cards and correspondence. There are 59 post cards and 26 letters. The majority of the letters are addressed to Peter Bradt (II), and his wife Jane Bradt. Most of the post cards are addressed to Peter Bradt (III). Other materials include invoices, receipts, promissory notes, certificates, booklets, broadsides, calling cards and photographs. The material within each series is arranged in chronological order.