Sends advice on naturalist matters.

W. H. Harvey’s work [with Wilhelm Sonder, Flora capensis (1859–65)],

and Robert Brown’s publication ["On the organs and mode of fecundation in Orchideae and Asclepiadeae", Trans. Linn. Soc. Lond. 16 (1833): 685–745].

Writes of having seen in S. America a Hymenopteran with tarsi covered with pollen-masses of Asclepias.

Interested in JPMW’s researches in South American caverns.

Mentions poor health.

Thanks for tracings.