This rather complicated machinery for aiding the memory is quite too mechanical to commend itself to any one 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.