1. Addis, T. (1922). Arch. intern. Med., 29, 539.
2. Private communication to Professor McDowall;Backwell,1921
3. The Physiology of Muscular Exercise, London;Bainbridge, F.A.,1919
4. Bell, G. H., and Knox, J. A. C. (1938). J. Physiol., 93, 36P. Bell, G. H., Knox, J. A. C., and Small, A. J. (1939). Brit. Heart Jour., 1, 229.
5. The Heart Rate;Boas, E.P.; Goldschmidt, E.F.,1932