Five years after this paper on Etheric force was written, Dr. Henry Wood, of Boston, wrote an article, which appeared in The Arena of October, 1891, having the title Healing through Mind. Dr. Wood says: "Truth may be considered as a rounded unit. Truths have various and unequal values, but each has its peculiar place, and if it be missing or distorted, the loss is not only local but general. Unity is made up of variety, and therein is completeness. Any honest search after truth is profitable, for thereby is made manifest the kingdom of the real.... "We forget that immaterial forces rule not only the invisible but the visible universe. Matter, whether in the vegetable, animal, or human organism, is moulded, shaped, and its quality determined by unseen forces back of and higher than itself. We rely upon the drug, because we can feel, taste, see, and smell it. We are colour-blind to invisible potency of a higher order, and practically conclude that it is non-existent."--Healing through Mind. CHAPTER V. ETHERIC VIBRATION. THE KEY FORCE. Discovery is not invention.--Edison. Science has been compared to a stately and wide-spreading tree, stretching outward and upward its ever-growing boughs. As yet mankind has reached only to its lowermost branches, too often satisfied with the dead calyxes which have fallen from it to the ground, after serving their uses for the protection of the vital germs of truth. The seed of the next advance in science can only germinate as the dry husk decays, within which its potentiality was secretly developed. For upwards of ten centuries false portions of the philosophy of Aristotle enslaved the minds of civilized Europe, only, at last, to perish and pass away like withered leaves. The most perfect system of philosophy must always be that which can reconcile and bring together the greatest number of facts that can come within the sphere of the subject. In this consists the sole glory of Newton, whose discovery rests upon no higher order of proof. In the words of Dr. Chalmers, "Authority scowled upon this discovery, taste was disgusted by it, and fashion was ashamed of it. All the beauteous speculation of former days was cruelly broken up by this new announcement of the better philosophy, and scattered like the fragments of an aerial vision, over which the past generations of the world had been slumbering in profound and pleasing reverie." Thus we see that time is no sure test of a doctrine, nor ages of ignorance any standard by which to measure a system. Facts can have a value only when properly represented and demonstrated by proof. Velpeau said nothing can lie like a fact. Sir Humphry Davy asserted that no one thing had so much checked the progress of philosophy as the confidence of teachers in delivering dogmas as facts, which it would be presumptuous to question. This reveals the spirit which made the crude physics of Aristotle the natural philosophy of Europe.