Although he continued his work and training at Guy's, Keats devoted more and more time to the study of literature, experimenting with verse forms, particularly the sonnet. In May 1816, Leigh Hunt agreed to publish the sonnet "O Solitude" in his magazine, "The Examiner", a leading liberal magazine of the day. It was the first appearance in print of Keats' poetry, and Charles Cowden Clarke described it as his friend's red letter day, the first proof that Keats' ambitions were valid. Among his poems of 1816 was "To My Brothers". In the summer of that year, Keats went with Clarke to the seaside town of Margate to write. There he began "Calidore" and initiated the era of his great letter writing. On his return to London, he took lodgings at 8 Dean Street, Southwark, and braced himself for further study in order to become a member of the Royal College of Surgeons.