1. Altshuler, I. M.: Hypnotism and brain physiology. J. Mich. Med. Soc., 26:725–729, 1927.
2. Astruck, P.: Über psychische Beeinflussung des vegetativen Nervensystems in der Hypnose. I. Hypnotische Beeinflussung der Herztätigkeit und der Atmung. Arch. f. d. ges. Psychol., 95:266–80, 1923. (Abstr., Dunbar, 240).
3. Baernstein, L. N.: An experimental study of the effect on waking suggestibility of small doses of scopolamine hydrobromide. Thesis for M. A. degree, University of Wisconsin, 1929. (Abstr., Hull, 99–101.)
4. Bass, M. J.: Differentiation of the hypnotic trance from normal sleep. J. Exper. Psychol., 14:382–399, 1931.
5. Bennett, T. L., and Venables, J. F.: The effect of emotions on the gastric secretion and motility in the human being. Brit. Med. J., 2:662, 1920.