_Cf_.
Sir Oliver Lodge, _Electrons_, London, 1906, p.

200 .-- ED.] When the electron is subjected to an acceleration, a transverse wave is produced, and an electromagnetic radiation is generated, of which the character may naturally change with the manner in which the speed varies.

If the electron has a sufficiently rapid periodical movement, this wave is a light wave; while if the electron stops suddenly, a kind of pulsation is transmitted through the ether, and thus we obtain Roentgen rays.
Sec.4.NEW VIEWS ON THE CONSTITUTION OF THE ETHER AND OF MATTER New and valuable information is thus afforded us regarding the properties of the ether, but will this enable us to construct a material representation of this medium which fills the universe, and so to solve a problem which has baffled, as we have seen, the prolonged efforts of our predecessors?
Certain scholars seem to have cherished this hope.

Dr.Larmor in particular, as we have seen, has proposed a most ingenious image, but one which is manifestly insufficient.

The present tendency of physicists rather tends to the opposite view; since they consider matter as a very complex object, regarding which we wrongly imagine ourselves to be well informed because we are so much accustomed to it, and its singular properties end by seeming natural to us.