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Microampere currents applied with metal electrodes to the mesenteric vessels 0% mice caused thrombosis, accornpn~~ied by electrolyte dissociation arid gas formation. When the products of dissociation were removed, clramping, canstriction, or tkrollnhosis did not occur. i ! hen gltiss-starch electrodes were used, currents u p ta 200 applied for 30 minutes, were without eflest. Changing to platintam electrodes and applying 5$-BrL1 currents cdused, in Iess than 30 seconds, corlstrictioa~ at the negative pole, clumping, and tkron~bosis, witIaout constriction a t the positive pole. Measiarem~ents showed a n increase in pH a t t h e riegative pole

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