Professor E. J. Conway of University College, Dublin, was guest of honor at the very fascinating symposium on Regulation of the Inorganic Ion Content of Cells which was held on April 6, 1960, in London. The symposium was chaired by Professor A. L. Hodgkin of Cambridge, England, and brought together an illustrious group of investigators from the United Kingdom, Europe, and the United States.
Six papers were presented, which were discussed by the invited guests. Professor Conway discussed energy barriers to active transport of sodium in muscle and the redox pump theory. He pointed out in the discussion that the hydrogen ion which appears in the gastric juice probably has a redox origin; on idea generally accepted by workers in this field. Professor Ussing discussed osmotic regulation and ion transport as evaluated with the frog skin preparation. The use of the red cell as a model for the study of