Referee's report by Richard Tetley Glazebrook, on a paper 'The refractive indices of water and of sea-water' by J W Gifford Sectional Committee: Physics and Chemistry Recommended for publication in the 'Proceedings of the Royal Society of London'. Suggests not going beyond five figures in the index values. Diagram to be reproduced on a smaller scale. [Published in the 'Proceedings of the Royal Society of London'] nd [1906]