Action of Alternating Magnetic Fields upon Ferromagnetic Particles

WILL you allow me to demur to the statement on p. 349 of the issue of NATURE of March 2 that “No satisfactory interpretation of the phenomena was given” of certain experiments of mine on magnetism. The Physical Society invited me in 1928 to give an address on the subject of a discourse which, at the request of the late Sir James Dewar, I had given in 1923 at the Royal Institution. My address at the Physical Society, published in abstract in the Proceedings of that Society (vol. 40, part 5, August 15, 1928) ended as follows: