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Abstract
A previously described in vitro method of studying secretion by measurements of an optical transverse section of the ciliary processes was used. It ivas found that the mechanism responsible for the secretory pump was specific for sodium ions and discriminated between sodium and lithium. A high concentration of potassium in the medium did not affect the pump. Inhibitors such as cyanide, dinitrophenol, azide, and ouabain, but not monoiodoacetate, inhibited secretion. The similarities between the transport mechanism in other epithelial tissues and in the ciliary processes are discussed.