Letter from [John Walter] Gregory, Geology Department, The University, Glasgow, to [Alan Archibald] Campbell Swinton [Esquire], 66 Victoria Street, London, S. W. 1. Informs he received a response from Petavel, enclosing a copy [enclosure not present], expressing his lack of surprise. States that Mr Ockenden, son in law of Beeby Thompson, is trying furthertests on the sensitivity of diviners to radioactivity, unsure of when they are due to take place. Informs he will be broadcasting on divining in Glasgow on the following day. 30 January 1928