He was a very productive scholar in the period after he left college. He edited the first vol. in the Bangor Manuscripts Soc. , Gwaith barddonol Howel Swrdwal a'i fab Ieuan ( 1908 ) and in the same series Detholiad o waith Gruffudd ab Ieuan ab Llewelyn Vychan ( 1910 ), both editions based on British Museum (Library) MSS. His main work, Barddoniaeth William Llŷn , was published in 1908 , followed by A manual of Welsh literature ( 1909 ) based on lectures he had given at University College Cardiff , 1902-03 . Morrice was one of the first generation of editors of the work of the cywydd poets and though these editions have the shortcomings of their period he could have become an acknowledged editor and literary historian and he could have followed a univesity career. He was nominated by the College Board for the chair of Welsh at St. David's College Lampeter in 1903 but the college Council did not accept the proposed arrangements. He was for a time lecturer in Welsh at University College Cardiff . Wales in the seventeenth century appeared in 1918 and his D.Phil. dissertation, Social conditions in Wales under the Tudors and Stuarts , in 1925 .

He retired from the rectorship of Helmdon Brockley, Northants in Oct. 1951 ; he d. 22 Jan. 1953 in Bournemouth .