1. Alvarez, W. C., Vanzant, F. R. and Osterberg, A.: Daily variation in the concentration of acid and pepsin in the gastric juice of three persons observed for two months, Am. J. Dig. Dis. 3: 102, 1936.
2. Batterman, R. C. and Ehrenfeld, I.: The ambulant treatment of the peptic ulcer syndrome: The comparative effectiveness and constipating action of antacids, Gastroenterology 9: 141, 1947.
3. Cummins, G. M., Jr., Grossman, M. I., and Ivy, A. C.: A study of the time of “healing” of peptic ulcer in a series of sixty-nine cases of duodenal and gastric craters, Gastroenterology 7: 1, 1946.
4. Pollard, H. M., Bachrach, W. H., and Block, M.: The rate of healing of gastric ulcers, Gasteroenterology 8: 435, 1947.
5. Steigmann, F., and Shulman, B.: The time of healing of gastric ulcers: Implications as to therapy, Gastroenterology 20: 20, 1952.