It is part of the wealth of the lower church that it contains an admirable primitive fresco by an artist of genius rarely encountered, Pietro Cavallini, pupil of Giotto. This represents the Crucifixion; the three crosses rising into a sky spotted with the winged heads of angels while a dense crowd presses below. You will nowhere see anything more direfully lugubrious, or more approaching for direct force, though not of course for amplitude of style, Tintoretto's great renderings of the scene in Venice. The abject anguish of the crucified and the straddling authority and brutality of the mounted guards in the foreground are contrasted in a fashion worthy of a great dramatist. But the most poignant touch is the tragic grimaces of the little angelic heads that fall like hailstones through the dark air. It is genuine realistic weeping, the act of irrepressible "crying," that the painter has depicted, and the effect is pitiful at the same time as grotesque. There are many more frescoes besides; all the chapels on one side are lined with them, but these are chiefly interesting in their general impressiveness - as they people the dim recesses with startling presences, with apparitions out of scale. Before leaving the place I lingered long near the door, for I was sure I shouldn't soon again enjoy such a feast of scenic composition. The opposite end glowed with subdued colour; the middle portion was vague and thick and brown, with two or three scattered worshippers looming through the obscurity; while, all the way down, the polished pavement, its uneven slabs glittering dimly in the obstructed light, was of the very essence of expensive picture. It is certainly desirable, if one takes the lower church of St. Francis to represent the human heart, that one should find a few bright places there. But if the general effect is of brightness terrorised and smothered, is the symbol less valid? For the contracted, prejudiced, passionate heart let it stand.