3. _Disposition or Mood systems._—Among the loosely organized complexes in many individuals, and possibly in all of us, there are certain dispositions toward views of life which represent natural inclinations, desires, and modes of activity, which, for one reason or another, we tend to suppress or are unable to give full play to. Many individuals, for example, are compelled by the exactions of their duties and responsibilities to lead serious lives, to devote themselves to pursuits which demand all their energies and thought and which, therefore, do not permit of indulgence in the lighter enjoyments of life; and yet they may have a natural inclination to partake of the pleasures which innately appeal to all mankind and which many actually pursue; in other words, to yield to the impulsive force of the innate disposition, or instinct, of play. But these desires are repressed. Nevertheless the longing for these pleasures, under the impulses of this instinct, recurs from time to time. The mind dwells on them, the imagination is excited and weaves a fabric of pictures, sentiments, thoughts, and emotions the whole of which thus becomes organized into a systematized complex. There may be a conflict, a rebellion and “kicking against the pricks” and, thereby, a liberation of emotional force of the instinct, impressing, on the one hand, a stronger organization of the whole process, and, on the other, repressing all conflicting desires. Or, the converse of this may hold and a person who devotes his life to the lighter enjoyments may have aspirations and longings for the more serious pursuits, and in this respect the imagination may similarly build up a complex which may similarly express itself. The recurrence of such complexes is one form of what we call a “mood” which has a distinctively emotional tone of its own derived from the instincts and sentiments which are dominant. Such a “disposition” system is often spoken of as “_a side to one’s character_,” to which a person may from time to time give play. Thus a person is said to have “many sides to his character,” and exhibits certain alternations of personality which may be regarded as normal prototypes of those which occur as abnormal states.