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.
Akin to the above is the idea underlying many other "systems," and "secret methods"--the idea of Contiguity, in which words are strung together by fanciful connecting links. Feinagle describes this underlying idea, or principle, as follows: "The recollection of them is assisted by associating some idea of relation between the two; and as we find by experience that whatever is ludicrous is calculated to make a strong impression on the mind, the more ridiculous the association is the better." The systems founded upon this idea may be employed to repeat a long string of disconnected words, and similar things, but have but little practical value, notwithstanding the high prices charged for them. They serve merely as curiosities, or methods of performing "tricks" to amuse one's friends. Dr. Kothe, a German teacher, about the middle of the nineteenth century founded this last school of memory training, his ideas serving as the foundation for many teachers of high-priced "systems" or "secret methods" since that time. The above description of Feinagle gives the key to the principle employed. The working of the principle is accomplished by the employment of "intermediates" or "correlatives" as they are called; for instance, the words "chimney" and "leaf" would be connected as follows: "_Chimney_--smoke--wood--tree--_Leaf_."