Referee's report by Richard Whiddington, on a paper 'Determination of the adiabatic piezo-optic coefficient of liquids' by Chandrasekhara Venkata Raman and K S Venkataraman Sectional Committee: Physics Recommended for publication in the 'Proceedings of the Royal Society of London'. Suggests carrying out the experiment referred to in a footnate, which would add value to the paper. Suggests adding the result of such an experiment. This is not an objection to publishing the paper in its current form however. [Published in the 'Proceedings of the Royal Society of London'] Endorsed on verso as received 15 February 1939. [February 1939]