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The aids to memory supposed to be furnished by the various mnemonic systems may now be briefly considered. These methods of supplying the defects of a naturally weak memory, or of strengthening a fairly good one, are one and all artificial. This might not be a conclusive objection to them, were they really effective and permanent helps, enabling one who has learned them to recall with certainty ideas, names, dates, and events which he is unable to recall by other means. Theory apart, it is conceded that a system of memorizing which had proved widely or generally successful in making a good memory out of a poor one, would deserve much credit. But experience with these systems has as yet failed to show, by the stern test of practical utility, that they can give substantial (and still less permanent) aid in curing the defects of memory. Most of the systems of mnemonics that have been invented are constructed on the principle of locality, or of utilizing objects which appeal to the sight. There is nothing new in these methods, for the principle is as old as Simonides, who lived in the fifth century before Christ, and who devised a system of memorizing by locality. One of the most prevalent systems now taught is to select a number of rooms in a house (in the mind's eye, of course) and divide the walls and the floors of each room into nine equal parts or squares, three in a row. Then "On the front wall-that opposite the entrance of the first room-are the units, on the right-hand wall the tens, on the left hand the twenties, on the fourth wall the thirties, and on the floor the forties. Numbers 10, 20, 30, and 40, each find a place on the roof above their respective walls. One room will thus furnish 50 places, and ten rooms as many as 500, while 50 occupies the centre of the roof. Having fixed these clearly in the mind, so as to be able readily and at once to tell the exact position of each place or number, it is then necessary to associate with each of them some familiar object (or symbol) so that the object being suggested, its place may be instantly remembered, or when the place is before the mind, its object may immediately spring up. When this has been done thoroughly, the objects can be run over in any order from beginning to end, or from end to beginning, or the place of any particular one can at once be given. All that is further necessary is to associate the ideas we wish to remember with the objects in the various places, by which means they are readily remembered, and can be gone over in any order. In this way, one may learn to repeat several hundred disconnected words or ideas in any order, after hearing them only once." This rather complicated machinery for aiding the memory is quite too mechanical to commend itself to anyone accustomed to reflect or to take note of his own mental processes. Such an elaborate system crowds the mind with a lot of useless furniture, and hinders rather than helps a rational and straightforward habit of memorizing. It too much resembles the feat of trying to jump over a wall by running back a hundred or more yards to acquire a good start or momentum. The very complication of the system is fitted to puzzle rather than to aid the memory. It is based on mechanical or arithmetical associations-not founded on nature, and is of very small practical utility. It does not strengthen or improve the habit of memorizing. which should always be based upon close attention, and a logical method of classifying, associating, and analyzing facts or ideas. Lord Bacon, more than two centuries ago, wisely characterized mnemonic systems as "barren and useless." He wrote, "For immediately to repeat a multitude of names or words once repeated before, I esteem no more than rope-dancing, antic postures, and feats of activity; and, indeed, they are nearly the same thing, the one being the abuse of the bodily, as the other is of mental powers; and though they may cause admiration, they cannot be highly esteemed." In fact, these mnemonical systems are only a kind of crutches, sometimes useful to people who cannot walk, but actual impediments to those having the use of their limbs, and who by proper exercise can maintain their healthy and natural use indefinitely. I have given you an account of one of these artificial systems of memory, or systems of artificial memory, as you may choose to call them. There have been invented more than one hundred different systems of mnemonics, all professing to be invaluable, and some claiming to be infallible. It appears to be a fatal objection to these memory-systems that they substitute a wholly artificial association of ideas for a natural one. The habit of looking for accidental or arbitrary relations of names and things is cultivated, and the power of logical, spontaneous thought is injured by neglecting essential for unessential relations. These artificial associations of ideas work endless mischief by crowding out the natural ones.

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