THE CONCENTRATIONS OF FREE AMINO ACIDS AND OTHER ELECTROLYTES IN CEREBROSPINAL FLUID, IN VIVO DIALYSATE OF BRAIN, AND BLOOD PLASMA OF THE DOG *

The concentrations of free amino acids in plasma, CSF and in vivo dialysates of peripheral blood (neck sac fluid) and central nervous tissue (brain sac fluid) from each of five dogs (neck sac fluid from four of five dogs) were determined by ion‐exchange chromatography. Dialysates were obtained by implanting small dialysis sacs filled with a dextran‐saline solution into the subcutaneous tissue of the neck or the parenchyma of the brain at least 10 weeks before sample collection.

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