Thanks for Smith's advice [on sale of copies of Brand's "Amoenitates Academicae" translation and manuscript of second volume]; he was only offered 13 guineas so intends to offer it in London. Details of the second volume, which includes: essay on hybrid plants; two abridged dissertations of Koebrenter on 'Lychni cuculoalus' and 'Digitalis hybriae'; a complete Herbatio Anglica from Hudson's 1778 edition, details of arrangement. Requests advice on selling remaining copies of first volume. Has a system for mechanically arranging species of complicated genera by the shortest character of a species; believes some of the genera in "Systema Naturae" were arranged by a similar system.