The other difficulty is the chain-work, which has to be constructed upon the twelve braccia already erected, this being requisite to bind and secure the eight sides of the cupola, and which must surround the fabric, enchaining the whole, in such a manner that the weight which has hereafter to be laid on it shall press equally on all sides, the parts mutually supporting each other, so that no part of the edifice shall be too heavily pressed on or overweighed, but that all shall rest firmly on its own basis. Let Lorenzo then take one of these works, whichever he may think he can most easily execute; I will take the other, and answer for bringing it to a successful issue, that we may lose no more time.' Lorenzo having heard this, was compelled, for the sake of his honor, to accept one or other of these undertakings; and although he did it very unwillingly, he resolved to take the chain work, thinking that he might rely on the counsels of the builders, and remembering also that there was a chain-work of stone in the vaulting of San Giovanni di Fiorenza, from which he might take a part, if not the whole, of the arrangement. One took the scaffolds in hand accordingly, and the other the chain-work, so that both were put in progress. The scaffolds of Filippo were constructed with so much ingenuity and judgment, that in this matter the very contrary of what many had before expected was seen to have happened, since the builders worked thereon with as much security as they would have done on the ground beneath, drawing up all the requisite weights and standing themselves in perfect safety. The models of these scaffolds were deposited in the hall of the wardens. Lorenzo executed the chain-work on one of the eight walls with the utmost difficulty, and when it was finished the wardens caused Filippo to look at it. He said nothing to them, but with some of his friends he held discourse on the subject, declaring that the building required a very different work of ligature and security to that one, laid in a manner altogether unlike the method there adopted; for that this would not suffice to support the weight which was to be laid on it, the pressure not being of sufficient strength and firmness. He added that the sums paid to Lorenzo, with the chain-work which he had caused to be constructed, were so much labor, time, and money thrown away. The remarks of Filippo became known, and he was called upon to show the manner that ought to be adopted for the construction of such a chain-work; wherefore, having already prepared his designs and models, he exhibited them immediately, and they were no sooner examined by the wardens and other masters, than they perceived the error into which they had fallen by favoring Lorenzo. For this they now resolved to make amends; and desiring to prove that they were capable of distinguishing merit, they made Filippo chief and superintendent of the whole fabric for life, commanding that nothing