Chapter LXX: Section XXV: I have used the word duplicity in no depreciatory sense. In

chapter ii. of the "Seven Lamps," Section 18, I especially guarded this incrusted school from the imputation of insincerity, and I must do so now at greater length. It appears insincere at first to a Northern builder, because, accustomed to build with solid blocks of freestone, he is in the habit of supposing the external superficies of a piece of masonry to be some criterion of its thickness. But, as soon as he gets acquainted with the incrusted style, he will find that the Southern builders had no intention to deceive him. He will see that every slab of facial marble is fastened to the next by a confessed _rivet_, and that the joints of the armor are so visibly and openly accommodated to the contours of the substance within, that he has no more right to complain of treachery than a savage would have, who, for the first time in his life seeing a man in armor, had supposed him to be made of solid steel. Acquaint him with the customs of chivalry, and with the uses of the coat of mail, and he ceases to accuse of dishonesty either the panoply or the knight.

These laws and customs of the St. Mark's architectural chivalry it must be our business to develop.