REFERENCES

[1] Cannon: The American Journal of Psychology, 1914, xxv, p. 257.

[2] For a summary of his studies of the organization of the autonomic system, see Langley: Ergebnisse der Physiologie, Wiesbaden, 1903, ii², p. 818.

[3] See Cannon: American Journal of Physiology, 1905, xiii, p. xxii.

[4] See Sherrington: The Integrative Action of the Nervous System, New York, 1909, p. 19.

[5] Langley and Anderson: Journal of Physiology, 1895, xix, see pp. 85, 122.

[6] Sherrington: Loc. cit., p. 90.

[7] Elliott: Journal of Physiology, 1905, xxxii, p. 426.

[8] See Elliott: Journal of Physiology, 1913, xlvi, p. 289 ff.

CHAPTER III

METHODS OF DEMONSTRATING ADRENAL SECRETION AND ITS NERVOUS CONTROL

As stated in the first chapter, the inhibition of gastric secretion produced by great excitement long outlasts the presence of the object which evokes the excitement. The dog that was enraged by seeing a cat for five minutes secreted only a few drops of gastric juice during the next fifteen minutes. Why did the state of excitation persist so long after the period of stimulation had ended? This question, which presented itself to me while reading Bickel and Sasaki’s paper, furnished the suggestion expressed at the close of the last chapter, that the excitement might provoke a flow of adrenal secretion, and that the changes originally induced in the digestive organs by nervous impulses might be continued by circulating adrenin. The prolongation of the effect might be thus explained. Whether that idea is correct or not has not been tested. Its chief service was in leading to an enquiry as to whether the adrenal glands are in fact stimulated to action in emotional excitement. The preganglionic fibres passing to the glands are contained in the splanchnic nerves. What is the effect of splanchnic stimulation?