 Josef Zemp (1898–1904 and 1915–1916) and Albert Naef, who took over the presidency from Zemp between 1904 and 1915, pleaded for equality of treatment of the different old styles, rejecting any organisation of the periods into a hierarchy.They attached great importance to as complete a job of preservation as possible of the authentic work and a distinction between what was original and what was reconstructed, in order to avoid any pastiche.Starting from 1899, the «Anzeiger für schweizerische Altertumskunde» (Directory of Swiss Antiquities), published by the Swiss National Museum, served as the official organ of the «Society for the preservation of historical art monuments», complemented from 1901 on by the publication of the Communications in two editions, German and French.