_Series No. XIV._--In this series full-faced figures (granite-gray) similar in character to those made use of in former experiments, were employed. The objects were suspended by black silk threads, but while one of them remained stationary during the exposure the other was lowered through a distance of six and one half centimeters and was then drawn up again. The object moved was first that on the right hand, then that on the left. As the two objects in each case were exactly alike, the comparative effect of motion and rest in the object upon the persistence in consciousness of the corresponding image was obtained. The result shows a distinct preponderance in favor of the moved object, which has an average of 37.39 seconds per minute as against 28.88 seconds for the stationary object. The averages for the pairs, as seen at the foot of the columns, all run the same way, and only one exception to the general tendency appears among the individual averages. TABLE XIV. 1 2 3 4 5 Indiv. Av. S M S M S M S M S M S M I. 22.5 28.5 25 30.5 24.5 28 28 27.5 25.5 31 25.1 29.6 II. 47.5 55 53 42 48.5 53.5 34.5 39.5 49 52 46.5 48.4 III. 3 18 7.5 8.5 0 7.5 0 3.5 0 4 2.1 8.3 IV. 45 45 33.5 51.5 11 50.5 11 50 8 52.5 21.7 49.9 V. 54.5 51 53.5 54.5 49 51 30.5 38.5 56 55 48.7 50.0 VI. 21 32.5 26 33 29.5 37.5 30 35 30 36 27.3 34.8 VII. 48 55 56.5 49 41.5 54.5 44.5 53 35.5 54 45.2 53.1 VIII. 10.5 20.5 20.5 25 6 33 12.5 29.5 19 18 13.7 25.2 IX. 37.5 43.5 34.5 45 36 47.5 30 47.5 29 48.5 33.4 46.4 X. 13 39.5 18 34 19 33.5 19 33 10.5 44 15.9 36.8 XI. 17.5 43.5 47.5 32 27.5 36 46 16.5 52 16 38.1 28.8 29.09 39.27 34.14 36.82 26.59 39.55 26.00 33.95 28.59 37.36 28.88 37.39 S: Refers to figure left stationary. M: Refers to figure that was moved during exposure. General average: S, 28.88 sec.; M, 37.39 sec.