Abstract
The circulation through the paws of unanesthetized, trained dogs, after exclusion of vasomotor factors, varies directly with the temp. of the bath in which the paw is immersed. The arterio-venous O and CO2 differences, and the pH of the arterial and venous blood are constant in any single expt. over wide ranges of blood flow and metabolism. These observations are consistent with the hypothesis that the circulation through regions deprived of vasomotor control is detd. by the metabolic needs of the tissues.

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