Abstract
The volume of the thyroid was registered by an oncometer and a modified piston recorder. The arterial tension was also noted. The animals used were dogs, etherized and with a small dose of morphia per jugular. Infundibulin per jugular had the most powerful action in reducing the volume of the thyroid, although at times there was a preliminary momentary increase. Adrenalin, after a temporary increase, produced a decrement in the volume. An infusion of the fresh ovary of a pregnant cat augmented the size of the thyroid, a fact noted by Hallion. Mammary, corpus luteum, thyroid, placenta, iodine and parathyroid extracts also increased the volume. The anterior part of the pituitary decreased the volume.
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