i. 26 November 1839 - Bonn - (To Miss Caroline Hunneman.) Condolences on the death of her father, and future arrangements. (German).
ii. 28 November 1840 - Bonn - Publications. (Note by W.P.).
iii. 21 November 1841 - Bonn - Publications. (Note by W.P.).
iv. 29 January 1842 - Bonn - Acknowledges parcel via Dr. Klotsch. Publications. (Note by W.P. mentions Lambert's copy of Royle - illustrations, etc.).
v. 6 October 1843 - Bonn - Publications. Accounts. Dr. Klotsch. (German.). (note by W.P. 1843 Dec. 6.).
vi. 1 July 1844 - Bonn - Acknowledges parcels. Publications. (German.).
vii. 5 February 1845 - Bonn - Publications. (German.). (Note by W.P.).
viii. 10 April 1846 - Bonn - Publications. (German.). (Note by W.P. re. payments.).
ix. 6 October 1846 - Bonn - Payments. Publications. (German.).