The years between the sixteenth and twentieth of his age are the most critical of a young man's life, and in these years, during which our other chief London-born poets, Spenser, Milton, Gray, were profiting by the discipline of Cambridge and the Muses, Keats had no better or more helpful regular training than that of an ordinary apprentice, apparently one of several, in a suburban surgery. But he had the one advantage, to him inestimable, of proximity to his old school, which meant free access to the school library and continued encouragement and advice in reading from his affectionate senior, the head master's son. The fact that it was only two miles' walk from Edmonton to Enfield helped much, says Cowden Clarke, to reconcile him to his new way of life, and his duties at the surgery were not onerous. As laid down in the ordinary indentures of apprenticeship in those times, they were indeed chiefly negative, the apprentice binding himself 'not to haunt taverns or playhouses, not to play at dice or cards, nor absent himself from his said master's service day or night unlawfully, but in all things as a faithful apprentice he shall behave himself towards the said master and all his during the said term.' Keats himself, it is recorded, did not love talking of his apprentice days, and has left no single written reference to them except the much-quoted phrase in a letter of 1819, in which, speaking of the continual processes of change in the human tissues, he says, 'this is not the same hand which seven years ago clenched itself at Hammond.' It was natural that the same fiery temper which made him as a small boy square up against an usher on behalf of his brother,--an offence which the headmaster, according to his son Cowden Clarke, 'felt he could not severely punish,'--it was natural that this same temper should on occasion flame out against his employer the surgeon. If Keats's words are to be taken literally, this happened in the second year of his apprenticeship. Probably it was but the affair of a moment: there is no evidence of any habitual disagreement or final breach between them, and Keats was able to put in the necessary testimonial from Mr Hammond when he presented himself in due course for examination before the Court of Apothecaries. A fellow-apprentice in after years remembered him as 'an idle loafing fellow, always writing poetry.' This, seeing that he did not begin to write till he was near eighteen, must refer to the last two years of his apprenticeship and probably represents an unlettered view of his way of employing his leisure, rather (judging by his general character) than any slackness in the performance of actual duty. One of the very few glimpses we have of him from outside is from Robert Hengist Horne ('Orion' Horne), another alumnus of the Enfield school who lived to make his mark in literature. Horne remembered Mr Hammond driving on a professional visit to the school one winter day and leaving Keats to