Tour of Brussels. Music festival in progress. Met Belgian artists F. J. Navez and J. D. Odevaere. Dined with L. A. J. Quetelet. Met C. J. Keverberg, cofounder [with Johannes van den Bosch] of colonies at Frederiksoord and Hoogstraeten. Day in forest of Soignies. Journey from Brussels through Liege. Industrial activity at Seraing. [Letter continued 8 July:] Describes city of Aix-la-Chapelle.