Letter from Samuel Levine, on a paper 'The electrical effects due to sound waves in colloidal suspensions' by J A Enderby, to D C Martin, Assistant Secretary of the Royal Society Paper reference code: A186 Levine explains his reason for not answering questions 5 and 6 on the referee report form [see RR/73/251]. Written at University of Manchester, Department of Mathematics [England]. [Published in Proceedings A, 1951]. Date received not given. 1950