Referee's report by Max Born, on a paper 'Theory of the rheological properties of dispersions' by Albrecht Fröhlich and R Sack Sectional committee: Physics Recommended for publication in Proceedings,. The subject is not in his line but it seems to be an excellent paper that is of 'great practical and theoretical value'. Some small modifications should be made. [Published in Proceedings of the Royal Society A, 1946]. Date received not given. 1945