Comments regarding evaluation of a thesis by Mukherji, asks for news about Bhabha's appointment to Calcutta University; discussion of paper proofs and errata sent to M.E. Venkatachari (?), mentions a letter from Wolfgang Pauli, on the reduction of the Dirac equation to the Hamilton-Jacobi equation, says he will be in Bangalore in June; communicates correction to expression in paper, sends Madhava Rao thanks for seeing him off, together with C.V. Raman; sends corrections to mistakes in paper on mesons; communicates further corrections to the returned proofs, requests a further set of proofs; notes having posted corrections to Bhabha and Madhava Rao's coauthored paper, notes receipt of a second letter from Wolfgang Pauli, Bhabha mentions his dissatisfaction with Pauli's solution and suggests Madhava Rao attempt the problem; discussion on work with Max Born about the relationship between electron negative energy states and the calculation of second-order self-energy, asks Madhava Rao to confirm the hypothesis, suggests getting in contact with Born, at the Indian Institute of Science.