Letter from Carvel Gold to Dr A W Wolfendale, Department of Physics, Science Laboratories, South Road, University of Durham, Durham, DH1 3LE, England Enclosing the improved figures for Professor Gold's talk at the Royal Society, which he indicated would be sent. Pages 14 and 16 have been revised slightly and they are enclosed also. She hopes this does not cause Wolfendale too much inconvenience. 29 March 1974