_Law of Similars._--To begin with _resemblance_. It seems to be a law of our nature, that like shall remind us of like. The mountain, the forest, the river, that I see in my morning walk to-day, remind me of similar objects that were familiar to my childhood. Nor is it necessary that the resemblance should be complete. A single point of similarity is sufficient to awaken the conception of objects the most remote, and, in other respects, dissimilar. I pass in the street a person with blue eyes, or dark hair, or having some peculiarity of expression in the countenance, and am at once reminded of a very different person whom I knew years ago, or whom I met perhaps in another land; yet the two may be as unlike, except in the one point which attracts my attention, as any two persons in the world. An article of dress peculiar to the Elizabethan age, or to the court of Louis XIV. reminds us of the lordly dames and courtiers, or gallant warriors of those periods. A single feature in the landscape, perhaps a single tree, or projecting crag, on the mountain side, brings before us the picture of a scene widely different in most respects, but presenting only this one point of resemblance to the scene before us. _Not confined to Objects of Sight._--Nor is it the objects of sight alone that are suggestive of similar objects. The other senses follow the same law. Sounds suggest similar sounds; tastes, similar tastes; and along with the sounds, tastes, etc., thus recalled, are awakened conceptions of many things having no resemblance to the suggesting object, but associated in our previous perceptions with the object suggested. A certain succession of musical sounds, for example, recalls to the Swiss his native valley, and the mountains that shut it in, and brings back to his mind the scene of his childhood, and the peculiar customs of his father-land where he heard in former years that simple melody. With what a train of associations is a single name often fraught; what power of magic lies often in a single word! _Illustrations of other Laws._--Of the other principles of suggestion or association which have been named, it is not necessary to speak minutely. Their operation is obvious and indisputable. Illustrations will occur to every one. The palace of the king reminds us by contrast of the hovel of the peasant. The splendor of wealth and luxury suggests the wretchedness of poverty and want. The giant reminds us of the dwarf, and the dwarf of the giant. On the principle of contiguity in time and place, the sight of an object reminds us of events that have occurred in connection with it; the name Napoleon suggests Waterloo, and Wellington, and the marshals of the empire; St. Peter's and the Vatican suggest Raphael and his Transfiguration; a book, casually lying on my table, reminds me of the volume that formerly stood by its side on the shelf, and so carries me back to other scenes, and other days.