THIRST AND ITS INHIBITION IN THE STOMACH

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Abstract
Thirst is regularly suppressed before ingested water has been absorbed from the alimentary tract. The nature of this suppression was compared in 5 spp. of mammals. Water, placed into the stomach through a tube, stopped immediate drinking in proportion to the filling of the stomach in 3 spp. (rat, hamster, guinea pig), but had little effect in 2 spp. (dog, young rabbit). Factors that limit immediate drinking, therefore, resided in the stomach in 3 spp., though they did not require a distention approaching gastric capacity; they resided not there but in the pharynx in dog and young rabbit. Further, deficit of body wt. was a direct measure of water deficits up to 5% of body wt., for dog, rat and rabbit, which drank within 15 min. just enough water and not too much to restore their wts. to within 1% of the initial. Other spp. needed food and time as well to recover their wts. Exptl. procedures affecting water exchanges that incidentally diminished the food intakes required as controls animals that were equally treated but allowed water ad libitum.
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