i. 10 October 1839 - Hamburg - Publications.
ii. 26 April 1842 - Hamburg - Publications. (German).
iii. 30 October 1842 - Hamburg - Fire has damaged his house and library. Publications. Orchids. (German).
iv. 14 July 1843 - Hamburg - Publications (W.P. reports on available publications.) (German).
v. 28 May 1844 - Hamburg - Publications.
vi. 21 February 1845 - Hamburg - Non-receipt of publications.
vii. 10 June 1845 - Hamburg - Publications. Orchids.
viii. 22 July 1845 - Hamburg - Publications. Orchids.