The shortcomings of human speech are most evident in discussing complicated matters; and for this reason speech is supplemented in the engineering arts by drawings of different kinds. No man ever lived who could describe a complicated machine accurately to a listener, unless that machine differed but little from a machine with which the listener was acquainted. But hand a drawing of even a very complicated machine to a man who knows its language--and the whole nature of the object is laid bare to him; not only its general plan and purpose, but its details, with all their dimensions and even the approximate weights. So, when the forces representing a complicated naval situation are placed upon the game-board, all the elements of the problem appear clearly and correctly to each person; the imagination has little work to do, and the chance for misunderstanding is almost negligible. Of course, this does not mean that the game-board can decide questions with absolute finality. It cannot do this; but that is only because conditions are represented with only approximate realism, because the rules of the game may not be quite correct, and because sufficient correct data cannot be procured. The difficulties of securing absolute realism are of course insuperable, and the difficulties of getting absolutely correct data are very great. The more, however, this work is prosecuted, the more clearly its difficulties will be indicated, and therefore the more effectively the remedies can be provided. The more the game-board is used both on ship and shore, the more ease will be found in getting correct data for it, and the more correctly conclusions can then be deduced. These remarks, while intended for tactical games, seem to apply to strategical games as well; for both the tactical and the strategical games are simply endeavors to represent actual or probable situations and occurrences in miniature, by arbitrary symbols, in accordance with well-understood conventions.