Abstract
1. This experimental work was undertaken as a reply to a paper published by Banus ('18).2. The existence of a metabolic gradient in the stem of Tubularia is demonstrated in this paper in four different ways.(a) Differential susceptibility of apical and basal regions of the stem to ether and cyanide. Apical regions are more susceptible.(b) Differential capacity of apical and basal regions to reduce potassium permanganate. The apical end of the organism has the greatest reducing power.(c) Difference in electrical potential along the stem. Apical regions are electronegative (galvanometrically) to basal levels within the limits of the individual. (At a certain distance from the original hydranth of Tubularia a new individual is arising and the apical end of this is likewise electronegative to regions anterior to its level.) Since in general electronegativity is associated in protoplasm with increased oxidative metabolism, this difference in electrical potential along the stem of Tubularia is evidence that dis...
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