We are told by Herodotus that science is to know things truly; yet past experience shows us that what has been called knowledge at one period of time is proved to be but folly in another age. Science is to know things truly, and the laws of nature are the same yesterday, to-day, and forever. Throughout the universe the same laws are at work and regulate all things. Men interpret these laws to suit their own ideas. The system which Keely is unfolding shows us that there is not one grain of sand, nor one invisible corpuscule of floating matter, that does not come under the same law that governs the most mighty planet, and that all forms of matter are aggregated under one law. "The designs of the Creator as expounded by our latest teachers," writes Gilman, "have required millions of ages to carry out. They are so vast and complex that they can only be realized in the sweep of ages. One design is subordinated by another without ever being lost sight of, until the time has arrived for its complete fulfilment. These designs involve an infinitude of effort, ending often in what, to our view, looks like failure, to be crowned after a series of ages with complete success at last." In this long chain of physical causes, says Dr. Willcox, seemingly endless, but really commencing with that one link that touches the hand of Him who made all matter, and all potencies that dwell within matter, this cosmical activity has been ceaseless, these cosmical effects numerous past conception, by which universal nature has slowly unfolded and become the universe of to-day. In this way both Christianity and science unfold their truths progressively. Truth, like the laws of nature, never changes; yet truth as an absolute thing, existing in and by itself, is relatively capable of change; for as the atoms hold in their tenacious grasp undreamed-of potencies, so truths hold germs potential of all growth. Each new truth disclosed to the world, when its hour of need comes, unfolds and reveals undreamed-of means of growth. As the Rev. George Boardman has said of Christianity, so may it be said of science: Being a perennial vine, it is ever yielding new wine. A philosopher has said that if ever a human being needed divine pity it is the pseudo-scientist who believes in nothing but what he can prove by his own methods. In the light of Keely's discoveries, science will have to admit that when she concentrates her attention upon matter, to the exclusion of mind, she is as the hunter who has no string in reserve for his bow. When she recognizes that a full and adequate science of matter is impossible to man, and that the science of mind is destined ultimately to attain to a much higher degree of perfection than the science of matter--that it will give the typical ideas and laws to which all the laws of physics must be referred--then science will be better supplied with strings than she now is, to bring her quarry down.