Referee's report by Paul Dirac, on a paper 'Excitation and ionization of atoms by electron impact. II. The Born and Oppenheimer approximations - Comparison with experiment' by David Robert Bates, A Fundaminsky and Harrie Stewart Wilson Massey Sectional committee: Mathematics Paper reference code: A4 Recommended for publication in Philosophical Transactions. Report on paper A3 [RR/73/10] contains Dirac's full comments. [Published in Philosophical Transactions A, 1950]. Date received not given. 1950