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Active preparations are being made for the issue of a third edition of the World List of Scientific Periodicals. The last edition of this scientific reference work, issued in 1934 and covering the years 1900–1933, is now out of print though still in constant demand. It contains upwards of 33,000 titles of journals and includes the holdings of some 180 libraries in Great Britain and Ireland. The new edition, which is designed to include all the scientific and technical periodicals that appeared during the period 1900–1947 as well as the holdings of additional libraries, will therefore be considerably larger. Librarians are being asked to co‐operate as before by sending particulars of all those journals on their shelves that do not appear in the second edition or are shown there as having no location in this country to: The Secretary, World List of Scientific Periodicals, c/o The Zoological Society of London, Regent's Park, London, N.W.8, from which office further information may be obtained.