-Lettre sans date (mais pas avant 1702) : He has much to tell him: having had learned letters from many countries and expecting many very rare books; and the King of Prussia who when he came to my home had given me a gold coin with 100 ducats. has now sent me three volumes from the Royal and Electoral treasures bound in red leather and decorated with gold; and Begerus has added learned treatises on coins and another examining volumes of Greek and Roman antiquities, and he has read a work in Belgian on Christ descended from David. (Oxford, Bodleian Library, MS D’Orville 477 fols. 7-9).