Abstract
1. 1. The weight and the glycogen and lipid contents of the liver and fat body are highest m autumn at the onset of wintering and smallest in spring after spawning, while the water and protein contents of the liver show the opposite trend. 2. 2. Liver glycogen content is lower in mature females than in males. 3. 3. Phosphorylase activity in liver and lipase-esterase activities in liver and fat body vary depending mainly upon environmental temperature being lowest during wintering. 4. 4. Phosphorylase activity correlates positively and lipase-esterase activity and lipid content in the liver correlate negatively with the size and age of the frog. 5. 5. Liver glycogen content increases towards northern latitudes with the longer wintering period.
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