AMONG the many useful services rendered by the Geological Survey of India must be reckoned the issue of a Quinquennial Review of the Mineral Production, initiated during the directorship of Sir Thomas Holland. The first of these reviews appeared in 1905 (Rec. Geol. Sun. India, Vol. 32, Part I.), and covered the period 1898–1903. Since then, four others have been published, the latest, covering the period 1919–23, being a voluminous and interesting account of the progress during the period, contributed by the director (E. H. Pascoe) and the senior officers of the Survey, including L. L. Fermor, J. Coggin Brown, H. C. Jones, C. S. Fox, and W. A. K. Christie.