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Rh 158. Thus you probably have a distinct idea—those of you, at least, who are interested in architecture—of the shape of the windows in Westminster Abbey, in the Cathedral of Chartres, or in the Duomo of Milan. Can any of you, I should like to know, make a guess at the shape of the windows in the Sistine Chapel, the Stanze of the Vatican, the Scuola di San Rocco, or the lower church of Assisi? The soul or anima of the first three buildings is in their windows; but of the last three, in their walls.

All these points I may for the present leave you to think over for yourselves, except one, to which I must ask yet for a few moments your further attention.

159. The trefoils to which I have called your attention in Niccola's pulpit are as absolutely without structural office in the circles as in the panels of the font beside it. But the circles are drawn with evident delight in the lovely circular line, while the trefoil is struck out by Niccola so roughly that there is not a true compass curve or section in any part of it.