SWEDEN .—Acta Mathematica (1882+), founded by Mittag Leffler, one of the most important mathematical periodicals in the world, is edited by mathematicians of Sweden, Norway, Den mark and Finland, and is published by the Mathematical Insti tute, at Djursholm, of the Royal Academy of Sciences (K. Svenska Vetenskabsakademien), Stockholm. The Academy's Arkiv for Matematik, Astronomi och Fysik (1903+) is also of importance to the mathematician, as well as considerable mathe matical material in its Handlingar, Bihang til Handlingar, Arsbok, and Ofversigt. Svenska Aktuarieforeningens Tidskrift, Upsala (1914-17), and Skandinavisk Aktuarietidskrift, Upsala (1918+) contain mathematical material of value.
To Sweden must also be credited Bibliotheca Mathematica (1884-1915) founded and edited by Enestrom and, from 1888 on, the outstanding journal of its time for the history of mathe matics. (See below under United States.) SWITZERLAND.—The Societe Mathematique Suisse was founded in 1909 t3 promote mathematical research. The Societe Suisse des Professeurs de Mathematiques, otherwise named earlier, and founded in 190o, is primarily for professors in the secondary schools. The activities of both organizations are set forth in the
country's only separate mathematical periodical, L'Enseignement Mathematique, methodologie et organization de l'enseignement, philosophie et histoire des mathematiques, chronique scientifique, melanges bibliographie (1899+), Paris and Geneva. In addition to its serials the Schweizerische Naturforschende Gesellschaft (founded 1815) publishes Euler's Opera Omnia of which 2 2 vol umes have already appeared (up I Other sources where ma terial of interest, some of high order, may be found, are: Viertel jahrschrift der naturforschenden Gesellschaft in Zurich (1856+), Mitteilungen der naturforschenden Gesellschaft in Bern (1843+); Verhandlungen der naturforschenden Gesellschaft in Basel (1852+ ) ; and Bulletin de la Societe Vaudoise des Sciences Natu relles + , Lausanne.