I cannot enter on the other curious manuscripts which this library contains; nor have I anything to say of the numerous beautiful portraits and pictures with which its walls are adorned. The _Cenacolo_, or "Last Supper," by Leonardo da Vinci, in the refectory of the Dominican convent, is fast perishing. It has not yet "lost all its original brightness," and is mightier in its decay than most other pictures are in the bloom and vigour of their youth. I recollect the great Scottish painter Harvey saying to me, that he was more affected by "that ruin," than he was by all the other works of art which he saw in Italy. The grandeur of the central head has never been approached in any copy. One thing I regret,--I did not visit the Sant' Ambrogio, and so missed seeing the famous brazen serpent which is to hiss just before the world comes to an end. This serpent is the same that Moses made in the wilderness, and which Hezekiah afterwards brake in pieces: at least it would be heresy in Milan not to believe this. It must be comfortable to a busy age, which has so many things to think of without troubling itself about how or when the world is to end, to know that, if it must end, due warning will be given of that catastrophe. The vineyards of Lombardy are good, and monks, like other men, occasionally get thirsty; and it might spoil the good fathers' digestion were the brazen serpent of Sant' Ambrogio to hiss after dinner. But doubtless it will be discreet on this head. There is said to be in some one of the graveyards of Orkney, a tombstone on which an angel may be seen blowing a great trumpet with all his might, while the dead man below is made to say, "When I hear this, I will rise." The stone-trumpet will be heard to blow, we daresay, about the same time that the serpent of Sant' Ambrogio will be heard to hiss.