Abstract
To the Editor: —The iris is surrounded by an aqueous solution, yet mention of the physicochemical relationship between the two cannot readily be found in the literature. It would nevertheless appear that the question whether certain ions or solvents can penetrate through the iris is of significance to the understanding of aqueous dynamics. Since I myself do not have the necessary research facilities, I should like to draw attention to the following considerations, based on observations made in the last century and reported in a foreign language. Experimental. —1. Iris tissue, freshly obtained from oxen eyes, was tightened around one end of a hollow glass cylinder of 3 mm. diameter. An aqueous solution (2% potassium ferrocyanide) was introduced into the cylinder and the occluded end placed in distilled water. Immediately the level of the solution in the cylinder began to rise. 1 2. In a closed system, where external forces
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