Maestro Bernardino di Luca, the artist with whom the convent contracted for the fitting of the choir, is styled in the instrument _legnaiuolo_ (a "carpenter"). And no doubt Maestro Bernardino--or "Bino," for short, as he is called in the instrument when once at the beginning he has been named formally at full length--practiced all the more ordinary business of his trade. But there must have been carpenters _and_ carpenters, as to the present day there are painters _and_ painters, the same word indicating the calling of a Landseer and of a house-painter. This simple modesty of designation was a characteristic of the epoch. We find sculptors whose works are to the present day admired and studied as masterpieces styling themselves simply "stone-cutters." The contract is a long document, consisting of twenty-one clauses, the greater number of which are occupied with the most minute and detailed specification of the work to be done. It is to be executed "according to the model made by the said Bino, changing it or keeping it as it is according to the will of the fathers" (the monks of St. Peter's), "so as not to change the form and substance of the model." The prices agreed to be paid for each stall in the choir, with its arch above it, is ten golden ducats, which, allowing for the change in the value of the precious metals, may be considered to be about equal to three hundred and seventy-five dollars at the present day. The price does not seem by any means a small one. But Signor Rossi's researches have elsewhere shown that it is a mistake to suppose that the renowned professors of any branch of art were poorly paid in those days. The very reverse was the case. It would not be interesting to the reader to give him the details of the work which Maestro Bino bound himself to execute, but some of the stipulations must be mentioned, because they curiously illustrate the life of the times. The convent is to furnish all the wood--that which is required for the work itself, as well as all that may be needed, planks, scaffolding and the like, for the putting of it in its place. "_Item._ We give him rooms to work in and to sleep in and to cook in, as well as beds furnished with bedclothes. _Item._ Maestro Bino binds himself not to undertake any other work till the choir is wholly finished and put up, and he engages to do all the work within the walls of the convent. He is bound to keep four men at work under him, and more if necessary." The work is to be completed within two years should no impediment intervene by death or grave and manifest illness. The convent undertakes to furnish money from time to time as needed for the pay of the journeymen, and fifty ducats beforehand for the hiring of assistants and other necessary expenses.