But this questioning must be done logically, and orderly, and not in a haphazard way. As Fitch says: "In proposing questions it is very necessary to keep in view the importance of arranging them in the exact order in which the subject would naturally develop itself in the mind of a logical and systematic thinker." A number of systems have been formulated by different writers on the subject, all of which have much merit. The following System of Analysis, designed for the use of students desiring to acquire correct associations, was given in the volume of this series, entitled "Memory," and is reproduced here because it is peculiarly adapted to the cultivation and development of the faculty of discovering and forming correct associations and relations between ideas: SYSTEM OF ANALYSIS When you wish to discover what you really _know_ regarding a thing, ask yourself the following questions about it, examining each point in detail, and endeavoring to bring before the mind _your full knowledge_ regarding that particular point. Fill in the deficiencies by reading some good work of reference, an encyclopedia for instance; or consulting a good dictionary, or both: I. Where did it come from, or originate? II. What caused it? III. What history or record has it? IV. What are its attributes, qualities or characteristics? V. What things can I most readily associate with it? What is it most like? VI. What is it good for--how may it be used--what can I do with it? VII. What does it prove--what can be deduced from it? VIII. What are its natural results--what happens because of it? IX. What is its future; and its natural or probable end or finish? X. What do I think of it, on the whole--what are my general impressions regarding it? XI. What do I know about it, in the way of general information? XII. What have I heard about it, and from whom, and when? The following "Query Table," from the same volume, may be found useful in the same direction. It is simpler and less complicated than the system given above. It has well been called a "Magic Key of Knowledge," and it opens many a mental door: QUERY TABLE Ask yourself the following questions regarding the thing under consideration. It will draw out many bits of information and associated knowledge in your mind: I. What? II. Whence? III. Where? IV. When? V. How? VI. Why? VII. Whither?