1 2 3 4 5 Indiv. Av. F O F O F O F O F O F O I. 24 31 26.5 28.5 27 29 22 33.5 27.5 28 25.4 30.0 II. 53.5 50 52.5 52.5 56.5 55.5 43.5 43.5 56 51.5 52.4 50.6 III. 3 21.5 4 20 11 17 3.5 27 0 20.5 4.3 21.2 IV. 26.5 30 11 48.5 12.5 53 12 51 23 51 17.0 46.7 V. 40.5 56.5 48 56 55.5 55.5 53 55.5 53.5 55.5 50.1 55.58 VI. 27.5 40.5 23 31.5 24.5 32.5 31 29 27 33.5 26.6 33.4 VII. 50.5 54 53.5 56.5 53.5 53.5 40.5 52 55 55 50.6 54.2 VIII. 1 33.5 11 27 5 32 7.5 39 4.5 36.5 5.8 33.6 IX. 35.5 41.5 45.5 47 41.5 41.5 39 44.5 41 41.5 40.5 43.2 X. 19 30.5 21.5 30.5 21 29.5 16 37.5 22.5 30.5 20.0 31.7 XI. 11.5 52.5 18 51.5 14.5 50.5 23 50.5 15 52.5 16.4 51.5 26.59 40.14 28.59 40.86 29.32 40.86 26.45 42.09 29.55 41.45 28.10 41.08 _F_: Full-faced. _O_: Outlined. General average: full-faced, 28.10 sec.; outlined, 41.08 sec. _Series No. XI._--In this series full-faced figures were compared with outline figures of the same dimensions and form. Material, granite-gray cardboard. The area of the full-faced figures was the same as that of the figures of similar character employed in the various series, approximately 42 sq. cm.; the breadth of the lines in the outline figures was half a centimeter. The objects in each pair were exposed simultaneously, with the usual instructions to the subject, namely, to regard each object directly, and to give to each the same share of attention as to the other. The form of the experiment was suggested by the results of earlier experiments with lines. It will be remembered that the express testimony of the subjects, confirmed by fair inference from the tabulated record, was to the effect that lines show, in ideation as in perception, both greater energy and clearer definition than surfaces. By lines are meant, of course, not mathematical lines, but narrow surfaces whose longer boundaries are closely parallel. To bring the superior suggestiveness of the line to a direct test was the object of this series. And the table fully substantiates the former conclusion. For the outline figure we have a general average of 41.08 seconds per minute, as against 28.10 seconds for the full-faced figure.