You can learn to read it by yourself, learn to _remember_, if only you are not repelled by that stiff word "archæology." Just what generation made Dijon's crypt and Morienval's ambulatory, put the masonry roofs on the Caen abbatials, chiseled the column statues at the doors of Angers, Le Mans, and Chartres, made of Bourges' procession path a heavenly way of ruby, sapphire, emerald, and topaz, raised the tower at Senlis, paid tribute to St. Cecilia's gentleness in the white imagery of Albi's grim fortress--that is archæology. Archæology tells how Cluny lifted up a prostrate Christendom, how the Normans conquered England, how Abbot Suger reformed himself, how Bernard of Clairvaux exhorted Europe, how the Lion-hearted went crusading as had his fascinating mother before him, how Simon de Montfort won the Midi, how the wily Philippe-Auguste enlarged his domain, province by province--and all the while most of the Gothic cathedrals of France laid their foundations--and how the _bon-saint-homme-roy_, truest lover of the builders' art, sat under an oak tree, dispensing justice at first hand, with his loyal Joinville seated close beside him. That is archæology. It is written down clearly on great stone pages of perennial beauty for us to read--_if only we will_. A little knowledge of construction's laws is needed to show us how to see. A little more of history to guide us when to feel. If to love we must know, to know we must set ourselves to learn. Even in these days of easy motor travel one cannot go about book-laden. But there are open libraries in French cities where an inquirer is courteously lent the monographs on the town's monuments, or the big folios that picture the storied windows. It has, therefore, appeared advisable to give, with each cathedral, a list of its biographies, for they may be of use some rainy afternoon in France. It seems almost unnecessary to remind ourselves that in the XII and XIII centuries the Church of Europe--barring the Greek schism--was one and united, save for the quarrels inseparable from all manifestations of mankind's history, and that the Protestant of to-day descends from the same mediæval forefathers as does the Catholic, from the same builders of cathedrals, crusaders, feudal proprietors, and commune winners. To refuse sympathy to the two best centuries of the Middle Ages because, three hundred years later, occurred a break in western Christendom is as illogical as the attitude of those historians who would liken the religious movement of the XVI century to the antisocial outcrop of Oriental dualism called the Albigensian heresy.