What I set myself to do was this, to write a sort of grammar of thirteenth-century architecture, and to illustrate it with carefully measured details. I moreover resolved, when I did measure details or buildings, to do the part I wanted, and not to waste time by trying to make a finished drawing by means of the surroundings. The plan of the book fell through, for I had scarcely been at work two months before the advertisement of M. Viollet-le-Duc's Dictionary appeared, and I then continued tho drawings for my own instruction and without any intention of publication.