. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. LAURENS: MONOCHROMATIC LIGHTS. 279 of the middle bands among these being /jl/jl, /jl/jl, and \*\i, respectively. Five sets of twelve toads each were tested in each of the six double pairs of lights, and since each toad was given eight trials in each com- bination of lights, the total number of trials for the five sets was 960 in each single pair of lights or 5760 trials in all. Three of the five sets of twelve toads were the same as were used in testing the reactions to single monochromatic lig
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. LAURENS: MONOCHROMATIC LIGHTS. 279 of the middle bands among these being /jl/jl, /jl/jl, and \*\i, respectively. Five sets of twelve toads each were tested in each of the six double pairs of lights, and since each toad was given eight trials in each com- bination of lights, the total number of trials for the five sets was 960 in each single pair of lights or 5760 trials in all. Three of the five sets of twelve toads were the same as were used in testing the reactions to single monochromatic lights, when both the eye and the skin acted as receptors. Two new lots of twelve toads each were, however. Fig. 3. Curves representing the percentages of negative responses to the four sets of wave-lengths, when received through both the eye and the skin ( ): through the eye only ( ); and through the skin only ( ). Wave- lengths as abscissae and precentages of negative responses as ordinates. Points marked on axis of abscissae are the positions of the wave-lengths of the middle band of each light. B = Blue; G = Green; R = Red; Y = Yellow. selected for the other two sets. These tests were, therefore, carried out on 36 separate toads. It will be seen, by referring to Table 7, that the results of the tests of the reactions to balanced pairs of monochromatic lights were, in the main, very similar to those obtained in response to single mono- chromatic lights under the same conditions. The numbers under each pair of lights represent the combined results of two sets of trials,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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