home, suggestive in its splendor of the glory prepared for those who keep the faith. All Catholic art, in so far as it may in the strict use of language be called church art, separates itself from the larger and more indefinite category of religious art, and derives its character not from the personal determination of individual artists, but from conceptions and models that have become traditional and canonical. These traditional laws and forms have developed organically out of the needs of the Catholic worship; they derive their sanction and to a large extent their style from the doctrine and also from the ceremonial. The centre of the whole churchly life is the altar, with the great offices of worship there performed. Architecture, painting, decoration, music,—all are comprehended in a unity of impression through the liturgy which they serve. Ecclesiastical art has evolved from within the Church itself, and has drawn its vitality from those ideas which have found their permanent and most terse embodiment in the liturgy. Upon the liturgy and the ceremonial functions attending it must be based all study of the system of artistic expression officially sanctioned by the Catholic Church. The Catholic liturgy, or text of the Mass, is not the work of any individual or conference. It is a growth, an evolution. Set forms of prayer began to come into use as soon as the first Christian congregations were founded by the apostles. The dogma of the eucharist was the chief factor in giving the liturgy its final shape. By a logical process of selection and integration, certain prayers, Scripture lessons, hymns, and responses were woven together, until the whole became shaped into what may be called a religious poem, in which was expressed the conceived relation of Christ to the Church, and the emotional attitude of the Church in view of his perpetual presence as both paschal victim and high priest. This great prayer of the Catholic Church is mainly composed of contributions made by the Eastern Church during the first four centuries. Its essential features were adopted and transferred to Latin by the Church of Rome, and after a process of sifting and rearranging, with some additions, its form was completed by the end of the sixth century essentially as it stands to-day. The liturgy is, therefore, the voice of the Church, weighted with her tradition, resounding with the commanding tone of her apostolic authority, eloquent with the longing and the assurance of innumerable martyrs and confessors, the mystic testimony to the commission which the Church believes to have been laid upon her by the Holy Spirit. It is not surprising, therefore, that devout Catholics have come to consider this liturgy as divinely inspired, raised above all mere human speech, the language of saints and angels, a truly celestial poem; and that Catholic writers have well-nigh exhausted the vocabulary of enthusiasm in expounding its spiritual significance.