Sending moss specimens he has lately described. Awaiting specimens of 'Hypnum alpestre' and 'H. trifariense' for his "Scottish work"; 'H. halleri' is engraved. Found 'Splachnum rugosum' of "English botany" on Ben Lawers; believes it distinct from 'S. vasculosum', which he is drawing at the moment. He and [George] Arnott have been applying Smith's "favourite maxim" in classifying the splachnoid mosses, in doing so have overturned much of the previous work by other authors; observations on the genus. Regrets calling the work a new arrangement.

Since last writing 'Senecio tenuifolius' has been added to flora of Scotland. [William Jackson] Hooker on his journey to London and Paris. Received letter from Revd Lewis de Schweinitz [(1780-1834), botanist] of Pennsylvannia, who has raised number of American fungi to 2000. Requests specimen of 'Daltonia splachnoides'.