Note 96 — Chapter VIII
Reading edition
Vide Dewar, "The Physiological Action of Light," Nature, p. 433, 1877; quoted also by Semper, loc. cit. ante, Notes, p. 423. I do not think that the absence of the slight amount of color in the animals reared under the yellow light was due to the "optic current" of Dewar. The microscope showed that the chromatophores were just as large and just as numerous, and that they contained as much pigment, as those reared under the red light. The apparent absence of color was due to tinctumutation.—W.