. Electrolytes in biological systems, incorporating papers presented at a symposium at the Marine Biological Laboratory in Woods Hole, Massachusetts, on September 8, 1954 . 0,5 1,0 0 0,5 1,0 0 0,5 Hrs. 1,0 that on the basis of equally effective molar concentration differences, osmotic flow of ordinary water is, on the average, four times greater than the rate of diffusion of D2O. Similar observations on frog skin were recently made by Capraro and Bernini (i). This leaves one with the impression that the structure of the skin enters, in different ways, into the processes of osmosis and water di
. Electrolytes in biological systems, incorporating papers presented at a symposium at the Marine Biological Laboratory in Woods Hole, Massachusetts, on September 8, 1954 . 0,5 1,0 0 0,5 1,0 0 0,5 Hrs. 1,0 that on the basis of equally effective molar concentration differences, osmotic flow of ordinary water is, on the average, four times greater than the rate of diffusion of D2O. Similar observations on frog skin were recently made by Capraro and Bernini (i). This leaves one with the impression that the structure of the skin enters, in different ways, into the processes of osmosis and water diffusion. In dealing with the movement of water across the skin (and other structures as well) one must clearly distinguish between 'osmo-permeability' and 'diffusion permeability' (23). If it is correct that the rate of diffusion of heavy water across skin is the same in both directions, one must conclude that 'one-way osmosis' cannot be understood from the standpoint of diffusion. No one deserves more credit for establishing clear terms in the field of permeability and permeability for water, in particular, than M. H. Jacobs (30, 31). He pointed out that an assumption often made in the past, "that a concentration gradient of solute determines a concentration gradient of water of equal
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