THE twenty-sixth Report of the Imperial Economic Committee consists of a review of its constitution and work, and traces the development of its terms of reference. Suggested at the Imperial Economic Conference of 1923, the Committee was brought into being in 1925 with very restricted terms of reference that dealt only with the marketing of Empire food products in Great Britain. This led to the institution of the Empire Marketing Board in 1926, the year in which the Imperial Conference widened the work of the Committee to include the consideration of raw materials of manufacture as well as foodstuffs, and also industries and trades. The Conference of 1930 laid stress on the survey of mineral resources, and entrusted the Committee with the study of various aspects of Imperial co-operation. Its numerous reports on various products and materials are of considerable scientific value.