Morrison and Milne translated the Old Testament together; and although Morrison had the advantage of a far more intimate knowledge of the language, and was thus able to revise the work of his colleague, Milne also had made remarkable progress in his mastery of Chinese. The press was kept steadily at work. Tracts of various kinds were issued. Morrison wrote a little book called "A Tour round the World," the object of which was to acquaint his Chinese readers with the customs and ideas of European nations, and the benefits that had flowed from Christianity.