yet we know but little. In these mysterious agents there is much that is yet to be learned by future generations. Still we have discovered that both what you call electricity and what you called magnetism can be directed, controlled and utilized, by concentrated human will and intelligence. It is by these powers that we move our bodies through air and over country. It is by this power we propel our ships through the ocean, and our boats over our lakes; it is by this power that we navigate our aerial fleets from one part of the world to the other. In your clay you did not understand these great and useful agents. You tried to force them into use by cumbersome mechanical contrivances, but you had to spend more power in getting them associated than you could get out of them when they were associated. The result was that your people spent the world's stock of latent heat that was stored in your coal measures without getting any good results, whereas we can, by the force of our wills, assisted by science, control
