Thanks Smith for naming 'Opegrapha lyelli' after him and accepting numerous specimens, believes the species is distinct despite variations towards 'Opegrapha dendritica' and 'Opegrapha pulverulenta'. Thanks Smith for the notice he took of 'Lichen pollinarius' in "English Botany" which encouraged him in further investigation of mosses and lichens in his vicinity.

Has left specimens from George Don for Smith with [James] Sowerby. Employed Don to plant a shrubbery at his Angus residence, praises his botanical skills. Don accused by his "namesake at Cambridge" [James Donn (1758-1813) curator of Cambridge Botanic Garden] of acquiring from Cambridge his "pretended discoveries" as seeds, including: 'Hypericum barbatum', 'Centaurea intybacea', and 'Lamium dissectum?'; his 'Potentilla opaca' is the 'Potentilla obscura', and doubts 'Galium verrucosum'. Recommends Don's habitats be examined by trustworthy botanist; laments that neither [Dawson] Turner, [William Jackson] Hooker, or [William] Borrer ever went to Forfar during their trips to Scotland.

Delayed sending plant specimens for Smith from George Don and they now have mildew. Was unable to accompany Don to verify habitats of 'Lychnis alpina' and 'Ranunculus alpestris' at the Rocks of Clova in Scotland but believes he has no intention to deceive. Refers to Don's discoveries of 'Cheiranthus incanus', 'Oenothera biennis', and 'Potentilla tridentata' and his response to letters from Smith and Samuel Goodenough as evidence, along with description of his methods. Discusses Don's interactions with Smith's 'Festuca triflora', 'Arundo neglecta', 'Chaerophyllum aureum', 'Chaerophyllum sylvestre', 'Saxifraga geranioides' and other 'Saxifraga'. Smith still to pronounce on Don's 'Carduus polyanthemos', [James] Brodie thinks it 'Carduus leucographus'. Establishing plantations in the north, would like large quantities of 'Salix russelliana' if its use in tanning is proven, requests recommendation for nurseryman to supply 'Salix fragilis', and asks whether 'Populus tremula' is the poplar that grows in Swedish forests. Looking forward to seeing fourth volume of "Flora Britannica" and Linnaeus' "Lapland Tour".