All the subjects were graduate students in Harvard University or in Radcliffe College. Seven of the twelve had had from one to five or more years' training in laboratory investigations. Two subjects were ladies, the rest were gentlemen. Subject A was a man of bright cheerful pleasant even temperament, responsive, very musical, alert, physically vigorous, very careful in statement, and decided as to the distinctness of his emotional states. He uses his facial muscles a good deal while conversing. Subject B is musical, sings a good deal, is not especially demonstrative, nor always able to become adapted to the necessarily oft-repeated stimulations from the same colors and tones. This subject is especially discriminating as to shades, and has decided preferences for certain colors. Subject C usually found it difficult to find any decided feeling-tone for many of the stimuli used. This subject is rather reserved and undemonstrative as a rule. He is not at all musical, nor does he care for art. He is a rather cool but extremely careful observer, and is always guarded in his introspection. Subject D is impulsive habitually, flashy, responsive, especially to any suggestion of an æsthetic nature, such as forms, and very decided as to his experiences. He walks with a quick nervous step, is sprightly always, vivacious in conversation and outspoken. Subject E is rather non-emotional as he often says. He is very energetic, full of life, quick but not precise in all his movements, always on a tension, does not enjoy without effort anything so mild as the stimulations here used, and finds introspection of this affective nature difficult. Subject F is careful, experienced in introspective work, musical, talks a great deal, enjoys this kind of work, has decided preferences, is athletic and energetic. This subject makes use of facial, arm, and shoulder gestures quite freely in general conversation. Subject G has a penchant for talking a great deal, is decided in his likes and dislikes, musical, of an uneven temperament, sometimes cheerful, often cross, but always animated. Subject H confesses he does not ever especially enjoy colors, nor respond with any sign of demonstration to any situations. He is steady, calm, apparently unruffled, and not an especially acute observer of his own states, proving in this experiment unusually undiscriminative as to simple experiences. Subject I is rather morose, claiming to be habitually unmoved by even display of great passion or excitement. He finds it generally much easier to call up unpleasant than pleasant experiences, this being exceptional among the subjects. He is much slower than the average, and his feelings are not easily aroused. He is deliberative and confident as to his state of mind. He is nervous and often becomes fatigued before the hour's introspective work is over.