An introductory chapter on problems of protection and restoration of old organs is followed by sections on the compass of organ keyboards in Italy (L.F. Tagliavini), the organ cases (O. Mischiati), and a register of surviving organs in the province of Arezzo. In addition, there is extensive archival material on organ-making in Italy. Detailed discussion of the instruments in the exhibition, positive organs of various constructions, dating from the 16th to the 19th centuries. The illustrations show the various stages of their treatment.