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This paper presents the results of an investigation of green weight, dry weight, and of the ratio of green weight to dry weight in primordial leaf tissue in mutant and parental races of Phaseolus vulgaris. The data show that when grown under as nearly identical conditions as possible the primordial leaves of the mutant (tetracotyledonous) show a smaller green weight, a smaller dry weight, and a lower ratio of dry weight to green weight than those of the normal (dicotyledonous) parental race. Thus the tetracotyledonous race is distinguished not merely by striking morphological differences, but by physiological differentiation as well. In this respect the results for the heritable mutant race are in agreement with those for variant individuals within the same strain

Leaf-Tissue Production and Water Content in a Mutant Race of Phaseolus vulgaris