Received Smith's letter; it will give him great pleasure to see Smith here, directions. Apologises for his blunder in naming 'Lichen varians' for 'L. varius'; [James] Dickson marked it 'L. varius'. Uncertain about his parasitic plant, which seems "materially different" from 'Vaccinium oxycoccos'; observations. Thanks for Smith's offer to fulfil his desiderata, remembers two years ago sending a list he concludes did not reach Smith. Pleased to hear third volume of "Flora Britannica" is likely to appear soon.