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Stomach volumes of the lizard Lacerta vivipara were determined by injection with water to a pressure of 40 mm mercury. The relation between stomach volume and body weight is isometric. Food consumption per unit of body weight, however, decreases with increasing size. It is concluded that stomach volume is not the main factor which determines food consumption.

Food is lost from the stomach at an exponential rate. At normal temperatures, the stomach is nearly empty at the beginning of the morning activity period.