(spugna), thereby to diminish the weight; and several of the masters agreed in the opinion that a column must be erected in the centre, and the cupola raised in the form of a pavilion, like that of San Giovanni in Florence.  Nay, there were not wanting those who maintained that it would be a good plan to fill the space with earth, among which small coins (quatrini) should be mingled, that when the cupola should be raised, they might then give permission that whoever should desire the soil might go and fetch it, when the people would immediately carry it away without expense.  Filippo alone declared that the cupola might be erected without so great a mass of woodwork, without a column in the centre, and without the mound of earth; at a much lighter expense than would be caused by so many arches, and very easily, without any framework whatever.

“Hearing this, the syndics, who were listening in the expectation of hearing some fine method, felt convinced that Filippo had talked like a mere simpleton, as did the superintendents, and all the other citizens; they derided him therefore, laughing at him, and turning away; they bade him discourse of something else, for that this was the talk of a fool or madman, as he was.  Therefore Filippo, thinking he had cause of offence, replied, ’But consider, gentlemen, that it is not possible to raise the cupola in any other manner than this of mine, and although you laugh at me, yet you will be obliged to admit (if you do not mean to be obstinate), that it neither must nor can be done in any other manner; and if it be erected after the method that I propose, it must be turned in the manner of the pointed arch, and must be double—­the one vaulting within, the other without, in such sort that a passage should be formed between the two.  At the angles of the eight walls, the building must be strengthened by the dove-tailing of the stones, and in like manner the walls themselves must be girt around by strong beams of oak.  We must also provide for the lights, the staircases, and the conduits by which the rain-water may be carried off.  And none of you have remembered that we must prepare supports within, for the execution of the mosaics, with many other difficult arrangements; but I, who see the cupola raised, I have reflected on all these things, and I know that there is no other mode of accomplishing them, than that of which I have spoken.’  Becoming heated as he proceeded, the more Filippo sought to make his views clear to his hearers, that they might comprehend and agree with him, the more he awakened their doubts, and the less they confided in him, so that, instead of giving him their faith, they held him to be a fool and a babbler.  Whereupon, being more than once dismissed, and finally refusing to go, they caused him to be carried forcibly from the audience by the servants of the place, considering him to be altogether mad.  This contemptuous treatment caused Filippo at a later period to say, that he dared