85. This practice appears to me especially useful to painters. I now give some examples of mixed contrast. 86. The left eye, having looked for some time at red, has an aptitude to see afterwards green, the complementary of red. If then it be attracted by yellow, it perceives a sensation resulting from the mixture of green and yellow. The left eye being shut, and the right eye, which has not been modified by the sight of red, being opened, it sees yellow, and it is possible that this yellow may appear more orange than it is really. 87. _If the left eye_ | _and had_ | _the latter would_ _had first seen_ | _afterwards seen_ | _have seemed_ Yellow Red Violet. 88. Red Blue Greenish. 89. Blue Red Orange-red. 90. Yellow Blue Blue-violet. 91. Blue Yellow Orange-yellow. 92. Red Orange Yellow. 93. Orange Red Red-violet. 94. Red Violet Deep blue. 95. Violet Red Orange-red. 96. Yellow Orange Red. 97. Orange Yellow Greenish-yellow. 98. Yellow Green Bluish-green. 99. Green Yellow Orange-yellow. 100. Blue Green Yellow-green. 101. Green Blue Blue-violet. 102. Blue Violet Reddish-violet. 103. Violet Blue Greenish-blue. 104. Orange Green Bluish-green. 105. Green Orange Reddish-orange. 106. Orange Violet Bluish-violet. 107. Violet Orange Yellowish-orange. 108. Green Violet Red-violet. 109. Violet Green Yellow-green. 110. Red Green Bluer. 111. Green Red Tinted-violet. 112. Yellow Violet A little bluer. 113. Violet Yellow Greenish. 114. Blue Orange Yellower. 115. Orange Blue More violet.