i. 1 March 1841 - Esslingen - Steudel's Nomenclator, Welwitsch's Abyssinian plants and N.Zealand plants. (German.).
ii. 16 April 1841 - Esslingen - Lists Abyssinian plants for Hooker, Lehmann, Barton, Fielding, Borrer, Soc. Dublin, Band (?), Lambert, R. Brown, Leefe, Coulter, and Hunneman. Publications. (German.).
iii. 18 August 1841 - Esslingen - Nomenclator, Abyssinian plants. Welwitsch and Hooker. (German.). (Note by W.P. Hopes Steudal goes on with Cryptogamic alphabet. 3rd set of Kotschy's Nubian plants.).
iv. 25 May 1842 - Babington, Leefe and Edwards. (German.). (Note says Kotschy from Nubia ready ...).
v. 17 September 1842 - Esslingen - Plants for most named in letter 2, plus Babington and Edwards. Publications. Wight, Arnott. (German.).
vi. March 1843 - Esslingen - (Written on blank sheet.) Nachrichten an die vesehrlichen Mitglieder der naturhistorischen Reisevereins, etc. Plants from Schimper's journey in Abyssinia, Welwitsch in Portugal, Kotschy in Georgia and Caucasia from Dr. Hohenacker. (German.). (partial translation in English.).
vii. 21 March 1843 - Esslingen - Letter followed by list of subscribers (through W.P.) to various collections, what they have paid, etc. Names as in letter no. 2 plus Babington and Pamplin. (German.).
viii. 22 August 1843 - Esslingen - Publications. Accounts. Offers plants for sale. Suggests W.P. buys Nomenclator from booksellers this being cheaper. (German.).
ix. 2 July 1844 - Esslingen - Abyssinian plants for Borrer, Lemann and Hooker. (Accounts for subscribers names in letter no. 2 execpt Fielding and Lambert.) Plants from Abyssinia and Nubia. Dr. Welwitsch, Schimper. Publications. (German.).
x. 15 June 1847 - Esslingen - Plants from Dr. Walker Arnott. Publications. (German). (Note from W.P. re. money sent to W.A. who will pay for one Kotschy Nubian collection. Accounts.).
xi. 24 April 1851 - Esslingen - Recommending his friend Herman Steudal to W.P. (German.).
xii. 7 May 1856 - Esslingen - Publications.
xiii. 15 June 1856 - Esslingen - Dr. H. Steudal reports sudden death of his father and disposal of his herbarium and library.
xiv. n.d. - (Esslingen?) - (Part of letter?) Abyssinian plants. (German.).