The four Psalm versions contained in his _Horæ Lyricæ_ had a prefatory note, “An essay on a few of David’s Psalms translated into plain verse, in language more agreeable to the clearer revelations of the Gospel,” which makes certain that he had already clearly in mind the evangelical psalter which, despite his absorption in other tasks and his long illness in 1712, finally appeared in 1719, “The Psalms of David imitated in the language of the New Testament and apply’d to the Christian state and worship.” Watts excluded twelve Psalms entirely and omitted passages from some of the one hundred and thirty-eight that were retained, because they were not adapted to Christian use. Although he never married, Watts was very fond of children. In 1715, in the midst of his program for the public service of song, his _opus magnum_, he prepared his “Divine Songs, attempted in easy language for the use of children.” It was to be used in connection with the “Catechism” he had prepared for their use. It was the first collection of its kind and was the forerunner of the immense supply of children’s songs that was to grow out of the activities of the Sunday school. One is amazed that the writer of “When I survey the wondrous cross,” or “Our God, our help in ages past,” could write so tender and graceful a lullaby as “Hush, my babe, lie still and slumber, Holy angels guard thy bed! Heavenly blessings without number Gently falling on thy head.” IV. WATTS’ ARGUMENTS FOR THE HYMN However kindly we may estimate the value of Watts’ hymns and of his evangelical metrical versions of the Psalms, we must recognize that his service as the protagonist of the free hymn is quite as great. His hymns and evangelical psalter would likely have suffered the fate of those of Wither and Mason, his immediate predecessors, had he not written attractive and practicable congregational hymns and versions, and not accomplished two other results essential to the substitution of the free hymn for the often grotesque Psalm versions. He did not simply write a miscellaneous lot of religious lyrics and shoot them like arrows into the air; he had a clear and efficient theory of church song, recognizing not only the varied needs, but the psychology underlying those needs, and produced “a system of praise” that supplied those needs and conciliated current prejudices. Again, in his prefaces and in his _Essay towards the Improvement of Psalmody_, he laid hymnological foundations that not only prepared the way for the introduction of his own hymns and versions, but also for such a fresh consideration of the whole subject as led to the revolution in the English song service; from these have come the freedom and spontaneity, genuineness and sincerity, definiteness of purpose, and deepening of personal experience which have blessed succeeding generations.