§ XLIII. And just in proportion as this courtly sensuality lowered the real nobleness of the men whom birth or fortune raised above their fellows, rose their estimate of their own dignity, together with the insolence and unkindness of its expression, and the grossness of the flattery with which it was fed. Pride is indeed the first and the last among the sins of men, and there is no age of the world in which it has not been unveiled in the power and prosperity of the wicked. But there was never in any form of slavery, or of feudal supremacy, a forgetfulness so total of the common majesty of the human soul, and of the brotherly kindness due from man to man, as in the aristocratic follies in the Renaissance. I have not space to follow out this most interesting and extensive subject; but here is a single and very curious example of the kind of flattery with which architectural teaching was mingled when addressed to the men of rank of the day. § XLIV. In St. Mark's library there is a very curious Latin manuscript of the twenty-five books of Averulinus, a Florentine architect, upon the principles of his art. The book was written in or about 1460, and translated into Latin, and richly illuminated for Corvinus, king of Hungary, about 1483. I extract from the third book the following passage on the nature of stones. "As there are three genera of men,--that is to say, nobles, men of the middle classes, and rustics,--so it appears that there are of stones. For the marbles and common stones of which we have spoken above, set forth the rustics. The porphyries and alabasters, and the other harder stones of mingled quality, represent the middle classes, if we are to deal in comparisons: and by means of these the ancients adorned their temples with incrustations and ornaments in a magnificent manner. And after these come the chalcedonies and sardonyxes, &c., which are so transparent that there can be seen no spot in them.[14] Thus men endowed with nobility lead a life in which no spot can be found."