Referee's report by John Desmond Bernal, on a paper 'An experimental X-ray shadow microscope' by V E Cosslett and W C Nixon Sectional committee: Physics Paper reference code: A88 Recommended for publication in the Proceedings. Bernal remarks on the papers importance, and comments on the best way to present it to the readers who will find it most useful, as it is essentially written for an 'A' audience but readers will be 'B' readers. [Published in Proceedings B, 1952]. Date received not given. 12 June 1952