Abstract
SIZE-DEPENDENT physiological processes have long been studied in poikilotherms as indicators of phenotypic acclimation and thermal adaptations presumed to be of genetic origin. The reviews by Fox (1939), Fry (1947), Prosser (1950), Heilbrunn (1952), and Rao and Bullock (1954) cover much of the pertinent literature (see also Freeman, 1950; Berg, 1953); Edwards, 1953; and Scholander et al., 1953). Size is usually recognized as an unavoidable variable, minimized by selection of experimental groups of narrow size range (Wells, 1935a; Fox and Wingfield, 1937; Wingfield, 1939; Rao, 1953; and Scholander et al., 1953). However, few attempts seem to have been made to correct physiological activity measurements for size differences in order to facilitate comparisons over wide ranges in weight. Wells (1935b) based corrections of some of his seasonal respiration data for the killifish, Fundulus, on a regression curve of respiration rate and size for a tenfold range of weight in these fishes. Weymouth et al. (1944) and Brody (1945) have suggested the use of the constant a
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