The next two years were passed in the country. On returning to Boston he again entered a book store, and, when eighteen years of age, he became a clerk in the then prosperous publishing house of Phillips and Sampson, located on Winter street. His connection with this house afforded him increased advantages; he was no longer an apprentice filling a menial position, but was conscious of occupying a responsible station in the business, where his integrity and intelligence were appreciated at their real value. He enjoyed the fullest confidence of his employers, and was soon looked upon by them as their "best" clerk. Selling by auction, especially in the evenings, was at that time a leading feature of the trade, and William Lee soon became an expert in that way, as well as in the general character of salesman to the country trade. There was scarcely a detail in the book trade with which he did not make himself personally familiar; he sought to post himself upon the character and contents of every book that was kept in stock, in order that he might be able to speak intelligently of them to his customers. This habit of general familiarization is one which, in the lapse of subsequent years, has proved of incalculable service to him; it is one which cannot be too earnestly commended to the attention of all young men who are to-day "working" up in the trade. At the age of twenty-one William Lee was allowed a share in the business, and three years later he accepted an equal partnership in the house. When it is remembered that at this time the house of Phillips and Sampson stood foremost as publishers in New England, the fact that, at the age of twenty-four, William Lee became an equal partner in this house is certainly striking. It bears but one explanation: William Lee owed his remarkable success to the talent which was born and bred in him, and to the consciousness of self-reliance, with which his employers, first and last, had inspired him. There is nothing in this life which will so readily develop the best qualities of manhood as a sense of responsibility, first to the individual himself and next to those whom he serves. Take away this sense of responsibility, every man becomes a machine; everything that he does is mechanical. In the firm of Phillips, Sampson and Company Mr. Lee continued as a partner for seven years. To his energy and industry the prosperity of the house was henceforth largely indebted. For twelve, and sometimes fifteen hours a day, he remained faithfully at his round of duties.