"Study of the cathode rays showed that they consisted of a stream of material particles, projected with great velocity, and possessing an apparent mass small compared with that of the hydrogen atom. The connection between the cathode [rays] and Röntgen rays [i.e., X rays] and the nature of the latter were also elucidated. Much of this admirable experimental work on the nature of the electric discharge has been done by Professor J.J. Thomson and his students in the Cavendish Laboratory Cambridge."