Four volumes, [1872x1877], containing notes on Welsh phonology, vowels, and words derived from Latin, possibly compiled by John Rhŷs in preparation for his lectures on Welsh philology. The book on Welsh phonology includes notes in Myvanwy Rhys's hand.
Notebooks, [1887]-1902, mostly comprising lists, compiled by John Rhŷs, of nouns, personal names and place names, included in manuscripts, glosses and codices, with related notes.
Reprints, 1900-1905, of the column 'Yn amsang ein tadau' from the Pembroke County Guardian, including contributions by, and relating to, John Rhŷs. Also included are proofs, reprints and cuttings of articles from the column, published 1895-1909.