We state the fact of the _reaction_ of the Outer upon the Inner, with its supporting quotations from the authorities, not for the purpose of instructing our readers in the art of training the emotions by means of the physical, for while this subject is highly important, it forms no part of the particular subject under our present consideration--but that the student may realize the close relationship existing between the Inner State and the Outer Form. These two elements or phases, in their constant action and reaction, manifest the phenomena of Human Nature, and a knowledge of each, and both give to us the key which will open for us the door of the understanding of Human Nature. Let us now call your attention to an illustration which embodies both principles--that of the Inner and the Outer--and the action and reaction between them, as given by that master of subtle ratiocination, Edgar Allan Poe. Poe in his story "The Purloined Letter" tells of a boy at school who attained great proficiency in the game of "even or odd" in which one player strives to guess whether the marbles held in the hand of his opponent are odd or even. The boy's plan was to gauge the intelligence of his opponent regarding the matter of making changes, and as Poe says: "this lay in mere observation and admeasurement of the astuteness of his opponents." Poe describes the process as follows: "For example, an arrant simpleton is his opponent, and, holding up his closed hand, asks, 'are they even or odd?' Our schoolboy replies, 'odd,' and loses; but upon the second trial he wins, for he then says to himself, 'the simpleton had them even upon the first trial, and his amount of cunning is just sufficient to make him have them odd upon the second; I will therefore guess odd;'--he guesses and wins. Now, with a simpleton a degree above the first, he would have reasoned thus: 'This fellow finds that in the first instance I guessed odd, and, in the second, he will propose to himself upon the first impulse, a simple variation from even to odd, as did the first simpleton; but then a second thought will suggest that this is too simple a variation, and finally he will decide upon putting it even as before. I will therefore guess even;' he guesses even and wins."