In the meantime, Brunelleschi had studied architecture, and made such progress that he had already conceived two grand projects--the one was the revival of the good manner of ancient architecture, which was then extinct, and the other was to discover a method for constructing the cupola of the church of Santa Maria del Fiore, in Florence, the difficulties of which were so great that, after the death of Arnolfo di Lapi, no architect had been found of sufficient courage and capacity to attempt the vaulting of that cupola.[1] If he could accomplish one or both of these designs, he believed that he would not only immortalize his own name, but confer a lasting benefit on mankind. Filippo, having resolved to devote himself entirely to architecture in future, set out for Rome in company with his friend Donatello, without imparting his purpose to any one. Here his mind became so absorbed that he labored incessantly, scarcely allowing himself the rest which nature required. He examined, measured, and made careful drawings of all the edifices, ruins, arches, and vaults of antiquity; to these he devoted perpetual study, and if by chance he found fragments of capitals, columns, cornices, or basements of buildings, partly buried in the earth, he set laborers at work to lay them open to view. One day, Filippo and Donatello found an earthen vase full of ancient coins, which caused a report to be spread about Rome that the artists were _treasure-seekers_, and this name they often heard, as they passed along the streets, negligently clothed, the people believing them to be men who studied geomancy, for the discovery of treasures. Donatello soon returned to Florence, but Filippo pursued his studies with unremitting diligence. Having exhausted his means, although he lived in the most frugal manner, he contrived to supply his wants, says Milizia, by pawning his jewels, but Vasari with greater probability, by setting precious stones for the goldsmiths, who were his friends. "Nor did he rest," says Vasari, "until he had drawn every description of fabric--temples, round, square, or octagon; basilicas, aqueducts, baths, arches, the Colosseum, amphitheatres, and every church built of bricks, of which he examined all the modes of binding and clamping, as well as the turning of the vaults and arches; he took note, likewise, of all the methods used for uniting the stones, as well as of the means used for securing the equilibrium and close conjunction of all the parts; and having found that in all the larger stones there was a hole, formed exactly in the centre of each on the under side, he discovered that this was for the insertion of the iron instrument with which the stones are drawn up, and which is called by us the mason's clamps (_la ulivella_), an invention, the use of which he restored, and ever afterwards put in practice. The different orders were next divided by his cares, each order, the Doric,