File of articles, in typescript and autographs labelled 'Beirniadaeth Lenyddol'. 28 ff., as follows: ff. 1-6, typescript article on Eben Fardd; ff. 7-11, typescript article on Islwyn; ff. 12-16, typescript article with autograph revisions entitled 'Datblygiad y Delyneg'; ff. 17-20, typescript article entitled 'Y Stori Fer'; f. 21, list of references to and articles on the poets Alun and Ieuan Glan Geirionydd to be found in Y Genhinen, Y Traethodydd, and Cymru; ff. 22-28, autograph article entitled 'Telynegwyr Cynnar y Bedwaredd Ganrif ar Bymtheg'.