Three Welsh Grammars; The Dream of Maxen Wledig; Elucidarium; Commotes and Cantreds of Wales; Astronomi; etc., mainly in the hand of Thomas Williams before he began to sign himself 'Thomas ap Wiliam physicwr'. Pages 112-114 and 129-130 are in the autograph of Robert Vaughan of Hengwrt, 16th May 1656, and Darogan Beli (p. 216) appears to be written by D. Jones (?o Lanvair Dyffryn Clwyd).

A manuscript containing scholastic tracts including disputations on Aristotle's 'De Anima' said to have been collected by Master Benedict and pronounced by the Master Regent of 'Fragfordie' [sic] in 1418; treatises on 'ars algoristica', physiology, and astronomy; 'liber de causis', probably the work of David Iudaeus [David ben Yom Tov]; 'comptus norembergensis'; and fragments of other texts, including a sheet containing verses beginning 'lumina lauas surgens gelida manus vnda' (cf. Schola Salerni).

An imperfect manuscript containing astrological texts and tables in Welsh and English in the hand of David Jones ('Dewi Fardd'), Trefriw, including 'Brydyn Cymraeg neu Almanac am y flwyddyn ... 1681 oed y byd 5630' by or attributed to 'Robert Lewis M:D:' of Dublin 'Printiedig ir Athro ... om ty yn chequer lane gwedderbyn ac arwydd y Carw Gwyn: Dulyn, o'r Werddon y 10 o fis Gorphenhaf 1680' (ff. 14 verso-16) and 'Astronomi Rheol y Ser ('gwaith Dr. Davies') (ff. 31-6); and also a transcript of 'Digrifwawd neu ymgynhebygiad i owdl y misoedd' by Siôn Tudur (ff. 7 verso-13).