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 therefore as yet ineffective for proof, but capable, I can scarcely doubt, of reduction to methodical order and scientific treatment. There are records and traditions of every degree of value, from utter worthlessness to the worth of the most authentic history, preserving the evidences of powers which may be generally described as spiritual. Through all ages, among all races, the living have alleged themselves from time to time to have seen the forms and even heard the voices of the dead. Scientific men have been forced by the actual and public exercise of the power under the most crucial tests—for instance, to produce insensibility in surgical operations—to admit that the will of one man can control the brain, the senses, the physical frame of another without material contact, perhaps at a distance. There are narratives of marvels wrought by human will, chiefly in remote, but occasionally in recent times, transcending and even contradicting or overruling the known laws of Nature. All these evidences point to one conclusion; all corroborate and confirm one another. The men of science ridicule them because in so many cases the facts are imperfectly authenticated, and because in others the action of the powers is uncertain, dependent on conditions imperfectly ascertained, and not of that material kind to which material science willingly submits. But if they be facts, if they relate to any element of human nature, all these things can be systematically investigated, the true separated from the false, the proven from the unproven. The powers can be investigated, their conditions of action laid down. Probably they may be so developed as to be exercised with comparative certainty, whether by every one or only by those special