Abstract
1. 1. Hypophysectomy and hypophysectomy combined with electrolytic lesions in the preoptic nuclei of the hypothalamus did not change sodium fluxes in larval Ambystoma tigrinum. Operated animals were able to maintain hydromineral balance in pond water and to adapt to very dilute solutions as well as controls. 2. 2. Glomerular filtration rate (GFR) was reduced in salt-loaded animals and increased when they were replaced in pond water. But these changes were about the same in operated-lesioned animals as in controls. Therefore, the hypothalamo-hypophysial system is not important in controlling GFR. 3. 3. Water reabsorption in the excretory system (kidney plus urinary bladder) of normal animals was stimulated by salt-loading and dehydrating. Operated animals did not show this effect, and we conclude that renal antidiuresis in these animals is under hypothalamo-hypophysial control. Arginine vasotocin may be the active hormone in this phenomenon.
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