While I have not been altogether successful in determining by this method the relative efficiency of different sense-impressions in holding the attention, the successful results are especially interesting. In Fig. 23 the tracing marked I. shows the movement of the hand during the thirty-five seconds that the subject was counting the strokes of a metronome; tracing II. shows the movement while counting for twenty-five seconds the oscillations of a pendulum. The latter movement is in this case much more extensive than the former, thus indicating that the visual impression held the attention much better than the auditory. The subject of this record is a well-known writer and novelist; and his description of his own mental processes entirely accords with this result; he is a good visualizer, and visual impressions and memory-images dominate his mental habits. [Illustration: FIG. 23.--I. COUNTING THE STROKES OF A METRONOME. Automatograph record. Time of record, 35 seconds. Direction of the attention →. Subject facing →. II. COUNTING PENDULUM OSCILLATIONS. Automatograph record. Time of record, 25 seconds. Direction of the attention →. Subject facing →.] [Illustration: FIG. 24.--FROM A TO A´, READING COLORS; FROM A´ ON, COUNTING PENDULUM OSCILLATIONS. Automatograph record. Time of record, from A to A´, 35 seconds; from A´ on, 25 seconds. Direction of the attention→. Subject facing →.] We may next turn to Fig. 24. The subject was asked to call the names of a series of small patches of color hanging upon the wall in front of him. He did this with some uncertainty for thirty-five seconds, and during this time his hand on the automatograph moved from A to A´. At the latter point he was asked to count the oscillations of a pendulum; this entirely changed the movement, the hand at once moving rapidly toward the pendulum. The pendulum was a more attractive sense-impression than the colors. The special point of interest in this record is, that upon examination the subject's color-vision proved to be defective, and thus accounted for the failure of the colors to hold his attention. [Illustration: FIG. 25.--COUNTING PENDULUM OSCILLATIONS. Time of record, 35 seconds. The record from B to C is continuous with that of A to B. Direction of the attention →. Subject facing →. The subject, a child of eleven years. Record reduced to ⅘ of original size.]