The contents are as follows. (i) 'Of the Chinese language, written in Holland,' circa 1735. (Folio 1.) Monboddo number 250. (ii) Chapters on the origin of language, 1766. (Folio 9.)Monboddo number 144. (iii) Chapters on grammar and derivation of language, 1766. (Folio 40.) This is apparently a continuation from Lord Monboddo's Folio Volume 12, now lost. Monboddo number 142. (iv) Chapters on 'a language of art', undated. (Folio 83.) Includes Monboddo number 140. (v) 'Observations on the Galibi and Caribee languages, and upon the origin and progress of language’. (Folio 101.) This is based on La Salle de L'Etang's ‘Dictionnaire galibi-françois’, 1763. Monboddo number 143. (vi) Part of a treatise on grammar, undated (Folio 131.) Monboddo number 137. (vii) “Of the formation of language and particularly of the radical words. With some observations upon the ‘Cratylus’ of Plato” 1796. (Folio 149.) (viii) 'Of the radical words in language', undated.(Folio 169.) Monboddo number 110. (ix) 'Of the difference of languages', 1766 (Folio 177.) A fragment in which Monboddo criticises Nicolas S Bergier's work on the Hebrew language. Monboddo number 111. (x) 'Of the corruption of language', 1766. (Folio 179.) Monboddo number 150.