A list of lines of defective 'cynghanedd' compiled in 1921 from the 1873 edition by Robert Ellis ('Cynddelw') of the poetry of Dafydd ap Gwilym. The volume was originally (1884) used as a trigonometry exercise book, and also contains quotations from Sophocles (Oxford Classics edition). Inset is a letter, 31 October 1891, from Sir Lewis Morris, Penbryn, Carmarthen, to Thomas Williams ('Eurwedd'), Dafen, relating to the writer's nomination for Parliament.