THE work of the Survey of India, especially in the domain of geodesy, has a world-wide reputation. The first edition of these tables, which are intended to facilitate calculations connected with survey operations of all kinds, appeared so long ago as 1868. They have more than once been copied and adapted by the surveys of other countries, though, of course, they are primarily intended to apply to the methods and scales used by the Survey of India. Auxiliary Tables of the Survey of India. Fifth edition. Revised and extended by Dr. J. de Graaff Hunter. Part 1: Graticules of Maps. Pp. 25. (R. 1 = 2s.) Part 2: Mathematical Tables. Pp. xiii + 89. (Rs. 2 = 4s.) Part 3: Topographical Survey Tables. Pp. xxi + 52. (Rs. 1.8 = 3s.) (Dehra Dun: Trigonometrical Survey; Part 1, 1921. Part 2, 1924. Part 3, 1923.)