. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. Chromatuphorc's and Color Change 683 In conjunction v\ith both of the preceding groups of methods, technics have often invoKed photomicrography'-' or the rapid (often heatj lixation of the animal for more leisurely analysis later, using temporarx or perman ent skin ''-"'"" Morphological Color Changes. Morjihological color changes inxoKe the accumulatit)n or chemical production or the destruction of pigment within the chromatophores. In the normal adapti\e color changes of animals, ji
. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. Chromatuphorc's and Color Change 683 In conjunction v\ith both of the preceding groups of methods, technics have often invoKed photomicrography'-' or the rapid (often heatj lixation of the animal for more leisurely analysis later, using temporarx or perman ent skin ''-"'"" Morphological Color Changes. Morjihological color changes inxoKe the accumulatit)n or chemical production or the destruction of pigment within the chromatophores. In the normal adapti\e color changes of animals, jihy siological and morphological color changes proceed simultaneouslv. The morphological changes ma\' result in both an increase in the amount ol pigment within each pigment cell and an increase in the number ol lunc tional chromatophores per unit area of ' '-" Quantitative studies ol morphological color changes have corre>pondingly invoKed two tspes ol technics: (1) the determination of changes in the number of lunctional chromatophores per unit area of surface, and (2) the determination ol changes in the total pigment content of the animals by chemical extrac-. Fig. 259. A, Graph showing rate of loss of red pigment frcjm the bodies oi: PaJiicnuiiictes kept on a white background. B, Graph showing increase in quantity of red pigment in the bodies of animals kept on a black background. From ; tion and colorimetric determinations of pigment c]uantity in the extracts''"' (Fig. 259). This whole subject has been abl\ rexiewed tor xcrtchrates by Sumner,'''" and in general the situation among in\ertebrates seems to jmc sent a quite similar picture. There appears to be a close functional relationship between physiological and morphological color changes. A correlation between the two has bed noted by many in\estigators.''"'-'- Maintained conccntrdiion ol a jiigment within a chromatophore seems usualK to be correlated with a reduction in quantitv
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