The object of the experiment was to observe, through the effect of powerful vibrations on the teeth of the resonant comb, a possible difference, too slight to be measured by calipers or by striking the teeth separately. The sound-waves, coming alike to all, would affect all alike unless there should be a difference in the receptivity of the teeth owing to differing density of metal, size, or some other condition not measurable by other means. By listening attentively near to the comb, the effect of the vibrations on the separate teeth could be heard. The tuning-fork was placed about forty feet away from the steel comb, and was struck a heavy blow with the iron bar. Only three of the twelve teeth vibrated in response. The others were not in sympathy. _They did not hear the sound._ I did not see the experiment, but it will serve to illustrate the value of simile. All knowledge is measured by comparison. The most effective teaching is done through parable or simile. A so-called magnetic orator or writer reaches his hearers or readers by aid of apt simile. In this the orator has the advantage. If one simile does not convey the point he wishes to make, he tries another and yet another until he has detected sympathetic signs of approval in the majority of his audience. If there are present a hundred listeners, it may require ten stories or ten similes to reach the entire hundred, as there may be ten kinds of interest or sympathy present to be reached. Farmers and gardeners may not be familiar with the terms that describe the experience of the mariner; mechanics may not understand the language of the counting room or of the various exchanges; and men may not appreciate the special accomplishments, sympathies, weaknesses or foibles of women. Each individual is a separate tooth or string in the instrument called society. Heredity and environment have tempered and shaped each individual differently from his fellows. Truth is always the same, but the vibrations that carry it must be regulated to suit the conditions and understandings of each person, or group of persons, to be harmonized by it. In an attack upon offensive and evil things, offensive similes are best employed. It is an application of the principle that a thief can best catch a thief. The object of this little book is to wage war upon fearthought and its brood of evil children. This is the excuse for writing under such offensive captions as "Don't Be a Sewer," and "Thou Shalt Not Strike a Woman," and also such ungrammatical caption as "I Can't _Not_ Do It." It is the opinion of the author that we are in the habit of taking evil too seriously. Evil is usually ridiculous, and while it thrives under the stimulation of serious consideration, it cannot stand ridicule. Shrewd politicians know this, and hence depend more upon the political cartoon to kill the political enemy, than upon all the reading matter possible to be printed.