While he bestowed his attention in this manner to minutiæ, he at the same time, as is observed by Mengs, led the way to a more enlarged and dignified style; entered into the most abstruse inquiries as to the source and nature of expression--the most philosophical and elevated branch of the art--and smoothed the way for the appearance of Raffaelle.” Vinci spent four years on his portrait of Mona Lisa Giocondo. DA VINCI AND THE PRIOR. The Last Supper of Lionardo da Vinci was painted in the Refectory of the Dominican convent of S. Maria della Grazia, at Milan. It was considered one of the proudest monuments of that city. While forming the plan of its composition, Da Vinci meditated profoundly on the subject; and having prepared himself by long study, and above all by a closer examination of nature, he began the execution by repeated sketches, both of the whole design, and of all its individual parts. He used to frequent the accustomed haunts of persons resembling, in their character and habits, those whom he was about to introduce in his picture; and as often as he met with any attitudes, groups, or features which suited his purpose, he sketched them in his tablets, which he always carried with him. Having nearly finished the other apostles in this way, he had left the head of Judas untouched for a long time, as he could find no physiognomy which satisfied him, or came up to the ideas he had formed of such a villainous and treacherous character. The prior of the convent grew impatient at being so long incommoded in that essential branch of monastic discipline which was carried on in the refectory or dining hall, where the picture was being painted, and complained to the Grand Duke, who called on the artist to explain the delay. Da Vinci excused himself by saying that he worked at it two whole hours every day. The pious head of the house renewed his representations with great warmth, and alleged that Lionardo had only one head to finish; and that so far from working two hours a day, he had not been near the place for almost twelve months. Again summoned before the prince, the painter thus defended himself. “It is true I have not entered the convent for a long time; but it is not less true that I have been employed every day at least two hours upon the picture. The head of Judas remains to be executed, and in order to give it a physiognomy suitable to the excessive wickedness of the character, I have for more than a year past been daily frequenting the Borghetto, morning and evening, where the lowest refuse of the capital live; but I have not yet found the features I am in quest of. These once found, the picture shall be finished in a day. If, however,” he added, “I still am unsuccessful in my search, I shall rest satisfied with the face of the Prior himself, which would suit my purpose extremely well; only that I have for a long time been hesitating about taking such a liberty with him in his own