The Image and the Reality - A Case Study of the Impacts of Medical Technology.B. Stocking and S.L. Morrison, 1978, Oxford University Press, pp 80,£3.00. ISBN 0-19-721220-4Ion Selective intracellular microelectrodes. How to make and use them.R C Thomas, 1978, Academic Press London pp 109,£7.00 ISBN 0 12 688750 0