To an ever-increasing, quite uncontrolled degree – for to the mind of present-day man it is only natural to translate every new discovery into practice as soon and as extensively as possible – electricity enters decisively into our modern existence. If we take all its activities into account, we see arising amongst humanity a vast realm of labour units, possessed in their own way not only of will but of the sharpest imaginable intelligence. Although they are wholly remote from man’s own nature, he more and more subdues his thoughts and actions to theirs, allowing them to take rank as guides and shapers of his civilization.