Many modern systems have been erected upon the foundation of Simonides and in some of which cases students have been charged high prices "for the secret." The following outline given by Kay gives the "secret" of many a high priced system of this class: "Select a number of rooms, and divide the walls and floor of each, in imagination, into nine equal parts or squares, three in a row. 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, while 50 occupies the centre of the room. One room will thus furnish 50 places, and ten rooms as many as 500. Having fixed these clearly in the mind, so as to be able readily and at once to tell exactly the 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 be 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 easily 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." We do not consider it necessary to argue in detail the fact that this system is artificial and cumbersome to a great degree. While the idea of "position" may be employed to some advantage in grouping together in the memory several associated facts, ideas, or words, still the idea of employing a process such as the above in the ordinary affairs of life is ridiculous, and any system based upon it has a value only as a curiosity, or a mental acrobatic feat.