Mr. Keely realizes the full extent of the difficulties which he yet has to contend with in obtaining continuity of action, though, with his sanguine temperament, anticipating near and complete success. To quote from his writings:--"The mathematics of vibratory etheric science, both pure and applied, require long and arduous research. It seems to me that no man's life is sufficient, with the most intense application, to cover more than the introductory branch. The theory of elliptic functions, the calculus of probabilities, are but as pigmies in comparison to a science which requires the utmost tension of the human mind to grasp. But let us wait patiently for the light that will come--that is even now dawning." All we can dream of loveliness within, All ever hoped for by a will intense, This shall one day be palpable to sense, And earth at last become to heaven akin. These four lines, from Robert Browning's sonnet on Keely's discoveries, read like an inspired insight into that "Age of Harmony," which interpreters of scripture prophecies anticipate the twentieth century will usher into our world; recalling Shakespeare's seeming knowledge, before Harvey's discovery even, of the circulation of the blood. "All truth is inspired." CHAPTER VII. THE KEY TO THE PROBLEMS. KEELY'S SECRETS. Causa latet, vis est notissima.--Proverb. (The cause is hidden, the power is most apparent.) Electricity is in principle as material as water; so it appears, and Mr. Carl Hering has expressed the fact with much of clearness and force. He says, "It is a well-known fact that the quantity of electricity measured in coulombs never is generated, never is consumed, and never does grow less, excepting leakage. The current flowing out of a lamp is exactly the same in quantity as that going into it; the same is true of motors and of generators, showing that electricity of itself is neither consumed while doing work nor is it generated. After doing work in a lamp or motor, it comes out in precisely the same quantity as it entered. A battery is not able to generate quantity or coulombs of electricity; all it is able to do is to take the quantity which pours in at one pole, and sends out at the other pole with an increased pressure. Electricity, therefore, is not merely force (or a form of energy), but matter. It is precisely analogous to water in a water circuit....--The Court Journal.