"We thus arrive at a view which nearly coincides with the old conception of Weber, but with the important difference that instead of a direct action at a distance we have an action transmitted by the ether, and further, that we have now a perfectly distinct numerical estimate of the magnitude of the electric atoms. Another difference from Weber is this: Weber assumed at haphazard that the positive particles were the more mobile. Now, in accordance with the Zeeman effect, we must give the negative particles that property. It has been found that in other electron phenomena also, it is always the negative electron which appears as the freely mobile one. Whence this curious one-sidedness comes, whether it will some day be possible to prove the existence of a free positive electron, or whether we must substitute a unitarian theory for the dualistic theory of electricity, we must leave to future developments."