Sends two copies of his book ["Beitrage zur chorographischen Kenntniss des Flussgebiets" (1822)]. He is commissioned by the King to produce a "Flora Hannoverana"; intends to arrange it on example of "Flora Danica". Requests exchange of "interesting and rare plants of England" in return for "several rare and new species of African plants"; he has a large collection from last 17 years.
Apologises for being unable to send Smith Essequebo plants as he had already given his duplicates to [Joseph Franz] Jacquin. Proposes a German edition of "English botany", regarding which he has already written to [James] Sowerby requesting the plates; few copies of the original in Germany owing to its high price; if Smith agrees requests critical notes on the species.