it was completed, though my sole object in making it was to obtain experience of clays suitable for bronze-casting. I was of course aware that the admirable sculptor Donatello had cast his bronzes with the clay of Florence; yet it seemed to me that he had met with enormous difficulties in their execution. As I thought that this was due to some fault in the earth, I wanted to make these first experiments before I undertook my Perseus. From them I learned that the clay was good enough, but had not been well understood by Donatello, inasmuch as I could see that his pieces had been cast with the very greatest trouble. Accordingly, as I have described above, I prepared the earth by artificial methods, and found it serve me well, and with it I cast the bust; but since I had not yet constructed my own furnace, I employed that of Maestro Zanobi di Pagno, a bell-founder.
When I saw that this bust came out sharp and clean, I set at once to construe!: a little furnace in the workshop erected for me by the Duke, after my own plans and design, in the house which the Duke had given me. No sooner was the furnace ready than I went to work with all diligence upon the casting of Medusa, that is, the woman twisted in a heap beneath the feet of Perseus. It was an extremely difficult task, and I was anxious to observe all the niceties of art which I had learned, so as not to lapse into some error. The first cast I took in my furnace succeeded in the superlative degree, and was so clean that my friends thought I should not need to retouch it. It is true that certain Germans and Frenchmen, who vaunt the possession of marvellous secrets, pretend that they can
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