Atlas of Gray Scale Ultrasonagrsphy Taylor, Kenneth J. W. (Churchill Livingstone, London, 1978). pp411. £ 19.50.Acoustic Instrumentation and Characterisation of Lung Tissue, Volume Two: Ultrasound in Biomedicine T. L. Rhyne, Sr. D.; Series Editor D. N. White. M. D. (Research Studies Press, Oregon, 1977). Pp. 109, US$14.95.Abdominal Gray Scale Ultrasonography Edited by B. B. Goldberg (John Wiley, Chichester, 1977) £21.00 ($35.50).Omission The book, “Evaluation of Artificial Joints” (Edited by D. Dowson and V. Wright, Biological Engineering Society, London, 1977), reviewed recently in this journal (January, 1978. p. 38), is available from Keith Copeland, Honorary Secretary, Biological Engineering Society, Biophysics Department, Faculty of Medical Sciences, University College, London WCIE 6BT, UK.Patents, Trade Marks, Copyright and Industrial Designs T. A. Blanco White, R. Jacob, and J. D. Davis (Sweet & Maxwell, London) pp. xxi + 178; £6.00 (hardback), £3.75 (paperback).Hospital Instrumentation Care and Servicing for Critical Care Units Edited by B. Spooner (John Wiley, Chichester, 1977) £6.20 ($10.45).