without obstructing the light of the windows, these stairs pass at the top into a spiral staircase of the same breadth, which finally reaches the level where the turning of the tribune is to begin. All this order, distribution, and ornamentation is so well varied, commodious, rich, durable, and strong, and serves so well to support the two vaults of the cupola that is to be turned upon it, that it is a very ingenious thing, and it is all so well considered and then executed in masonry, that there is nothing to be seen by the eyes of one who has knowledge and understanding that is more pleasing, more beautiful, or wrought with greater mastery, both on account of the binding together and mortising of the stones and because it has in it in every part strength and eternal life, and also because of the great judgment wherewith he contrived to carry away the rain-water by many hidden channels, and, finally, because he brought it to such perfection, that all other fabrics that have been built and seen up to the present day appear as nothing in comparison with the grandeur of this one. And it has been a very great loss that those whose duty it was did not put all their power into the undertaking, for the reason that, before death took away from us that rare man, we should have seen that beautiful and terrible structure already raised. Up to this point has Michelagnolo carried the masonry of the work; and it only remains to make a beginning with the vaulting of the tribune, of which, since the model has come down to us, we shall proceed to describe the design that he has left to the end that it may be carried out. He turned the curve of this vault on three points that make a triangle, in this manner: A B C