See Revue Encyclopédique, Oct. 1827, p. 219.
See Letters on Poland, p. 103.
Breslau 1821. The same author published John Sobieski's Letters, a work read throughout all Europe in its French translation by count Plater and Salvandy. A whole series of Memoirs, among which are some of great importance for Polish history, for instance those of Passek, of Wybicki, of Kolontaj, etc. owe their publication to the generous liberality of this true nobleman.