Note 45 — BOOK III. (continued 4)

As the head of the domestic establishment, he inserted in a book the pictures on which he and his brother were employed, with the prices which they obtained. On his death this was continued by Benedetto and Cesare Gennari, who recorded the works conducted by their surviving uncle. Such a registry was very useful to ascertain the dates and prices of the Guercinesque pictures; from the family of Gennari it came into possession of the Prince Ercolani, who made a valuable collection of MSS. and very rare books on the fine arts.