Throughout his service as professor of rhetoric, Mr Child, hampered though he was by the requirements of his laborious office, had pursued with unquenchable ardor the study of the English language and literature, particularly in their older forms, and in these subjects he had become an authority of the first rank long before the establishment of the English chair enabled him to arrange his university teaching in accordance with his tastes. Soon after he returned from Germany he undertook the general editorial supervision of a series of the 'British Poets,' published at Boston in 1853 and several following years, and extending to some hundred and fifty volumes. Out of this grew, in one way or another, his three most important contributions to learning: his edition of Spenser, his Observations on the Language of Chaucer and Gower, and his English and Scottish Popular Ballads. Mr Child's Spenser appeared in 1855.[3] Originally intended, as he says in the preface, as little more than a reprint of the edition published in 1839 under the superintendence of Mr George Hillard, the book grew upon his hands until it had become something quite different from its predecessor. Securing access to old copies of most of Spenser's poems, Mr Child subjected the text to a careful revision, which left little to be done in this regard. His Life of Spenser was far better than any previous biography, and his notes, though brief, were marked by a philological exactness to which former editions could not pretend. Altogether, though meant for the general reader and therefore sparingly annotated, Mr Child's volumes remain, after forty years, the best edition of Spenser in existence.