Finally, I would, if possible dispell all ideas of strangeness and mystery and semi-miracle as connected with electrical phenomena. There is no mystery; above all, there is no caprice. There are, in electricity and in all other departments of science, still many things undiscovered. It is certain that causes lead far back into that realm which is beyond present human investigation. _Force_ has innumerable manifestations that are visible, that are understood, that are controlled. Its _origin_ is behind the veil. A thousand branching threads of argument may be taken up and woven into the single strand that leads into the unknown. Out of the thought that is born of things has already arisen a new conception of the universe, and of the Eternal Mind who is its master. Among these things, these daily manifestations of a seeming mystery, the most splendid are the phenomena of electricity. They court the human understanding and offer a continual challenge to that faculty which alone distinguishes humanity from the beasts. The assistance given in the preceding pages toward a clear understanding of the reason why, so far as known, is perhaps inadequate, but is an attempt offered for what of interest or value may be found. End of Project Gutenberg's Steam Steel and Electricity, by James W. Steele