1. Phosphate ions in sea water are absorbed by oysters, principally by the gill, and are carried by the blood to all parts of the organism.2. Directly absorbed phosphate ions are incorporated into the tissues of adult oysters slowly, most remaining in water-soluble forms 24 hours after absorption.3. Significant amounts of phosphorus may be obtained by oysters through the direct absorption of phosphate ions from sea water.4. After 12 hours in P32O4, directly absorbed phosphate ions make up less than 0.1 per cent of the total blood phosphorus. This may be one of the several factors which limit the utilization of phosphorus from sea water.
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