My thanks are due to the Editor of the American Architect, for his courtesy in allowing me to build these ecclesiastical monographs upon the foundation of some articles which have appeared from time to time in a condensed form in the Boston (U. S. A.) paper; and also to the Editor of the Magazine of Art, for a similar kindness.
I should also like to acknowledge my indebtedness to the following authors and their works:
"Histoire de la Sainte-Chapelle." Morand.
"Histoire de Saint-Denis." Dom Millet.
"Histoire de Saint-Eustache." L'abbé Koenig.
"Inscriptions du Diocèse de Paris." F. de Guilhermy.
"Itinéraire Archéologique de Paris." F. de Guilhermy.
"l'Église Saint Julien-le-Pauvre." A. Le Brun.
"Monographie de l'Église Royale de Saint-Denis." F. de Guilhermy.
"Sacred and Legendary Art." Anna Jameson.