Referee's report by John Sealy Edward Townsend, on a paper 'Polarised röntgen radiation' by Charles Glover Barkla Sectional Committee: Physics and Chemistry Recommended for publication in Philosophical Transactions in full and without modification. All the illustrations should be reproduced. The experimental work seems very carefully conducted and the principles of the method used for detecting polarisation is interesting and original. The degree of polarisation is interesting and smaller than would be expected from the originally accepted theory of Rontgen rays, but the experimental evidence brought forward to show that there is some polarisation is very convincing. [Published in Philosophical Transactions A, 1905]. Endorsed on verso as received 8 February 1905. 6 February 1905