Abstract
1. 1. The inulin incubation technique was found not to be reliable for the measurement of perch tissue extracellular space. An injection method gave values not significantly different from chloride spaces. 2. 2. Intracellular values for the major electrolytes are given for muscle, liver and intestinal wall. Compared with muscle, liver and intestinal wall had high intracellular values for Na and Cl but similar amounts of K and Mg. Muscle chloride is present in much lesser quantities than that dictated by a K Donnan equilibrium and it is suggested that Cl is partially excluded from such cells. 3. 3. Comparing the perch tissue intracellular values with those of other vertebrates a remarkable constancy in Mg is noted (values ranging 14–16 mM/kg cell water).
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