Abstract

1. 1. Analyses are presented of the inorganic composition of the blood, pericardial fluid and kidney sac urine of Octopus dofleini. 2. 2. The pericardial fluid has the composition to be expected of an ultrafiltrate of the blood but the kidney sac urine is modified by both resorption and secretion. 3. 3. At low or moderate blood pressures the rate of formation of pericardial fluid is proportional to the excess of the hydrostatic pressure of the blood in the branchial heart over the colloidal osmotic pressure of the blood. 4. 4. The octopus responds to an increase in the blood volume by an increase in the rate of urine formation.

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