Atlas of Gray Scale UltrasonagrsphyTaylor, Kenneth J. W. (Churchill Livingstone, London, 1978). pp411.£19.50.Acoustic Instrumentation and Characterisation of Lung Tissue, Volume Two: Ultrasound in BiomedicineT. L. Rhyne, Sr. D.; Series Editor D. N. White. M. D. (Research Studies Press, Oregon, 1977). Pp. 109, US$14.95.Abdominal Gray Scale UltrasonographyEdited by B. B. Goldberg (John Wiley, Chichester, 1977)£21.00 ($35.50).OmissionThe 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 DesignsT. 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 UnitsEdited by B. Spooner (John Wiley, Chichester, 1977)£6.20 ($10.45).