i. 19 February 1856 - Halle - Through death of Dr. Kunze he enquires about dried plants. Ferns and mosses. (W.P. has note of plants from Welwitzch, Stephenson, Gardner and Douglas). (German).
ii. 2 March 1856 - Halle - Asks for Gardner and Douglas mosses and requests news of collection from various countries. (German).