The part played by the motor elements previously referred to in sustaining attention and prolonging (internal) sensation is here unmistakable. We have further evidence, too, of the value of the line in defining and strengthening the mental attitude. In a mass of homogeneous elements such as is presented by a uniform gray surface, the attention is equally engaged by all and definitely held by none. Monotony therefore means dullness. And the inhibition of incompatible attitudes being as weak and uncertain as the attitudes actually but loosely assumed, the latter are readily displaced, and the sensation to which they correspond as readily disappears. Hence the greater interest excited by the lined figures. The lines give definiteness and direction to the attention, and as definitely inhibit incompatible attitudes. And the shutting out of the latter by the spontaneous activity of the mind means that it is absorbed or interested in its present occupation. TABLE VII. 1 2 3 4 5 6 5 10 5 10 5 10 5 10 5 10 5 10 I. 29.5 23 24.5 21.5 27 18.5 28 26 27 20 25 29.5 II. 25.5 21 32.5 42.5 19.5 33 27 33.5 26 32 20 28.5 III. 4.5 18.5 12.5 5.5 0 3.5 7.5 11 10.5 18.5 0 7 IV. 33 31.5 28 32 42 44 25 45 38.5 43 41 36.5 V. 35 40.5 35 52.5 28 49.5 43 31 42.5 29 47.5 50.5 VI. 10.5 34.5 10.5 34.5 23 15 26 26.5 22 27 19.5 34.5 VII. 27 42 28.5 19 31.5 49 39 45.5 28.5 50.5 49.5 51.5 VIII. 13.5 21.5 19 15 21.5 18 23 22.5 19.5 18 24.5 21.5 IX. 33 43.5 36 37.5 35 40 26 45 31.5 44 21.5 43.5 X. 20.5 23 22.5 23 23 23.5 22 27.5 21.5 29 21 34.5 XI. 13.5 29 32 16.5 9.5 36.5 40.5 8.5 39.5 8.5 17.5 30.5 22.32 31.50 25.55 27.23 23.64 30.05 27.91 29.27 27.91 29.05 26.09 33.45