Art connoisseur Pierre-Jean Mariette's collection of drawings was greatly celebrated. During his lifetime he put together almost 9,000 items, carefully cataloguing them according to school and type. When he died, they were scattered as a result of 42 auctions (between November 1775 and January 1776). The incredible task of putting the collection back together was made possible because of the trade-mark (a capital M) which Mariette stamped on every drawing he owned and by the unusual mounting of each drawing on a blue background ('Mariette blue') which brought out the best qualities of the drawings. The whole collection will be published in six volumes: the first two are devoted to the French school, three to the Italian school and one to the Dutch, Flemish and German schools. Text in French. ILLUSTRATIONS: 1000 colour