A CLASSIFIED list of Smithsonian Publications, available for distribution, August 10, 1937, compiled by Helen Monro, has been published by the Smithsonian Institution, Washington (Publication 3394). The papers are supplied only as an aid to researches or studies in which the applicant is specially interested, and accordingly applicants are required to state the grounds for their request. Except where prices are given in the list, the papers are distributed gratis. The serial publications of the Smithsonian Institution are of three types: Smithsonian Contributions to Knowledge ; Smithsonian Collections ; Smithsonian Annual Reports. The reports are distributed gratuitously to libraries and individuals throughout the world, but very few are now available at the Institution. The papers issued in the Contributions to Knowledge and Miscellaneous Collections are not public documents but are printed in limited editions and distributed without charge to public libraries, educational institutions and learned societies. They are supplied to other institutions and to individuals at the prices indicated.