In the paper entitledAbsorbed Dose Near Bone: a Conductivity Method of Measurement, by J. F. Fowler,Brit. J. Radiol., 1957, xxx, 361–366, the following corrections should be made:1. In Fig. 2 the current ordinate should read “amp × 1012” instead of “amp × 1010”.2. In the second paragraph on page 362, “induced currents in excess of 10−9 amp” should read “induced currents in excess of 10−11 amp”.None of the other conclusions is affected by these errors.