Twenty-eight letters, 1937, from Saunders Lewis at Wormwood Scrubs Prison, London, to his wife, Margaret, his daughter, Mair and his aunt, Ellen Thomas, some being transcripts, containing news of life in prison where he, D. J. Williams, Fishguard, and the Reverend Lewis Valentine were serving nine months for their part in the burning of the Penyberth Bombing School.