An introduction to the study of colour vision (1915)
Parsons, John Herbert, Sir, 1868-1957 · Cambridge [Eng.] University Press; New York, G. P. Putnam's Sons · leaf 154
f- ^■^....■v -J^.. ^ V—■■■■■■;^-^ fl t f I // ?■* ^ i I // i s L I I * / ii.. . ■.-^. $t. . . .1. .....t^ > .. 4,/ ... … Fig. 43. Elevation of experimental dog box. (E. M. Smith.) Red, blue, yellow, green, and 14 shades of grey were used. First, theparticular colour was presented simultaneously with the grey which wasmost remote from it in brightness. When the animal had given proofof its ability to discriminate…
Color vision
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