Sometimes, however, a more than usual vividness of conception will make up for the want of this frequent coëxistence. When, for any reason, as excited feeling, or extraordinary interest in what we perceive, we grasp with peculiar clearness and force the idea presented, this vividness of mental conception will, of itself, insure the remembrance of the object contemplated. A man, on trial for his life, will be likely to recollect the faces and tones of each of the different witnesses on the stand, and the different judges and advocates, even if he never sees them afterward. We all know, also, that the lapse of time weakens the impression of any object or event upon the mind, and so lessens the probability of its recurrence to the thoughts. We more readily recall places and objects seen in a recent tour, than those seen a year ago. The exclusiveness of the connection is also an important circumstance. An air of music, which I have heard played or sung only on one occasion, and by one musician only, is much more likely, when heard again, to bring to mind the former player, than if it had also been associated with other occasions and other performers. Much depends, moreover, on native differences of temperament, on the habitual joyousness, or habitual gloom, which may pervade the spirits, on the lights and shadows which passing events may cast, in quick succession, on the mind, as good or bad news, the arrival of a friend, the failure of an enterprise, a slight derangement of any of the bodily functions, or even the state of the atmosphere. All these circumstances have much to do with the question, whether one conception or another shall be awakened in the mind by any object presented to its thoughts. _These Laws distinguished as Objective and Subjective._--It will be observed that the primary laws of suggestion, so called, are such as arise from the relations which our thoughts sustain to each other, while the secondary are such as arise from the relations which they sustain to ourselves, the thinking subjects. Hence the former have been called _objective_, the latter, _subjective_ laws.