Letter from Thomas Gold to Professor T G Cowling FRS, School of Mathematics, Department of Applied Mathematics, The Univesity of Leeds, Seeds, LS2 9JT, UK Does not know of sufficiently significant work of Leon Mestel to make him a really serious candidate for the Royal Society. This may be due to his ignorance of some of the areas in which he has worked, and if Cowling thinks this is the case then please send him the information that he thinks most relevant to Mestel's case. Gold would then study this and let him know. 12 July 1971