Letter from [John Douglas] Cockcroft to the Secretary of the Royal Society, regarding a paper 'The influence of magnetic fields on persistent currents in superconductors' by K C Mann, H [Grayson] Smith, and J O Wilhelm Paper reference code: A.71 Does not think the paper should be published until 'the apparent contradiction with other authors' has been resolved. Is willing to discuss this with the authors. [Not published in RS journals but published in the Physical Review, v. 54, 758, Nov. 1938]. 24 May 1938