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1. The short-circuit current and absolute fluxes of Na⁺ and Cl^- across the gastric mucosa of the 28-day rabbit foetus have been measured in vitro.

2. Substitution of Na⁺ in the solution bathing the mucosal surface by choline ion or K⁺ resulted in a 70% decrease in short-circuit current which was reversed when Na⁺ was restored to the mucosal solution. The portion of the short-circuit current dependent on the presence of Na⁺ in the mucosal solution was found to be equivalent to the net flux of Na⁺ from mucosa to serosa.

3. The net flux of Cl^- from serosa to mucosa was compared with the short-circuit current persisting when Na⁺ had been replaced in the mucosal solution. Averaged results from sixteen experiments indicated that the net flux of Cl^- was equivalent to 166% of the Na⁺ independent short-circuit current.

4. The results indicated that the component of short-circuit current associated with acid secretion was independent of the presence of Na⁺ in the mucosal solution.

5. The small scale of the experiments and the secretion of mucus by the preparation did not permit successful simultaneous measurement of H⁺ secretion and short-circuit current.

6. Replacement of Cl^- by SO₄^2- or glucuronate in the solutions on both sides did not result in a reversal or decrease in magnitude of the Na⁺ independent short-circuit current, even after allowing time for the tissue to become depleted of Cl^-. It is suggested that a non-specific active anion transport was occurring.