Referee's report by John Edward Lennard-Jones, on a paper 'Polar structures in the theory of conjugated molecules III. The energy levels of benzene' by David Parker Craig Sectional Committee: Chemistry Recommended for publication in the 'Proceedings of the Royal Society of London'. It is disappointing that the results are negative rather than positive. Suggests shortening parts III and IV. Suggests part III be confined to a shortened discussion of benzene, and omitting the work on butadiene. Paper A31, 'Polar structures in the theory of conjugated molecules IV. Butadiene', not published] [Published in the 'Proceedings of the Royal Society of London'] No received date. 28 March 1949