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2. Walls, D. P., thesis to the National University, Ireland (1944).
3. Bull, H. B., and Gray, J. S., Gastroenterology, 4, 175 (1945).
4. Conway, E. J., and Cooke, R., J. PhysioL, 100, 1 (1941).
5. Conway, E. J., and MacDonnell, E., unpublished observations (1944).