Abstract
1. 1. Sphaeroma tolerates salinities in the range 2–180 per cent sea water. 2. 2. Blood in maintained hypo- and hypertonic respectively to media more concentrated and less concentrated than 100 per cent sea water. 3. 3. Active sodium uptake decreases on transferance of animals from 2–100 per cent sea water and is markedly lower than the uptake by steady-state animals with the same blood concentration. 4. 4. On transference from 180-2 per cent sea water uptake of sodium at a blood concentration of 500 mM/l NaCl is higher than that of steady-state animals with this blood concentration. 5. 5. It is concluded that the absolute blood concentration is not the only factor involved in regulating rate of sodium uptake.
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