i. 24 November 1851 - Leipzig - Acknowledges "Beautiful books." Hopes to thank personally in Spring. Offers plants of Middle Europe.
ii. 2 November 1852 - Leipzig - Ferns and Orchids. Kunze. His father's Icones fl. Germanicae. Will publish next year a periodical on orchids - asks advice. Sir W. Hooker and any news of Welwitzch. (W.P. replies.).
iii. 30 May 1854 - Leipzig - Sends 3 copies of his newest book. Hoffman of Stuttgart. Kunze. Publications.