416 THE RESPIRATION 



very definite changes occur at the time the relief is experienced namely, 

 a slowing and steadying of the previously much quickened and irregu- 

 lar pulse, sweating, and a marked fall in the respiratory quotient. The 

 last mentioned change possibly gives a clue to the cause of the others. 

 In the early stages R. Q. is raised, which indicates that relatively more 

 C0 2 is being expelled from the blood into the alveolar air than oxygen 

 is being absorbed, perhaps because of inadequate movement of blood 

 through the lungs. At the time of the adjustment it is possible that a 

 pronounced vasodilatation occurs in the muscles and coronary arteries. 

 The former change by lowering the arterial blood pressure will relieve 

 the pumping action of the heart, and the latter will improve its power of 

 contraction by supplying it with more oxygen. 



RESPIRATION REFERENCES 



(Monographs) 



Barcroft, J.: The Eespiratory Function of the Blood, University Press, Cambridge, 

 1914. 



Borrutau, H.: Nagel's Handbuch der Physiologic, 1905, i, 29. 



Douglas, C. G.: Die Eegulation der Atmung beim Menschen, Ergebnisse der Physiol- 

 ogic, 1914, p. 338. 



Hill, Leonard: Caisson Sickness, International Medical Monographs, E. Arnold, 

 London, 1912. 



Keith, Arthur: The Mechanism of Eespiration in Man, Further Advances in Physi- 

 ology, E. Arnold, London, 1909. 



Schenck, F.: Innervation der Atmung, Ergebnisse der Physiologic, 1908, p. 65. 



(Original Articles) 



iKeith, Arthur: Cf. Further Advances. 



sHoover, C. F.: Arch. Int. Med., 1913, xii, 214; ibid., 1917, xx, 701. 

 sLee. F. S., Guenther, A. E., and Meleney, H. F.: Am. Jour. Physiol., 1916, xl, 446. 

 4Meltzer, S. J.: Jour. Physiol., 1892, xiii, 218. 



sHaldane, J. S., and Priestley, J. G.: Jour. Physiol., 1905, xxxii, 225. 

 Haldane and Douglas: Ibid., 1913., xlv, 235. 

 eHenderson, Y., Chillingworth and Whitney: Am. Jour. Physiol., 1915, xxxviii, 1. 



Henderson and Morriss: Jour. Biol. Chem., 1917, xxx, 217. 

 ?Krogh, A., and Lindhard: Jour. Physiol., 1913, xlvii, 30; ibid., 1917, li, 59. 

 sPearce, K. G.: Am. Jour. Physiol., 1917, xliii, 73; ibid., 1917, xliv, 369. 

 oSiebeck, E.: Skand. Arch. f. Physiol., 1911, xxv, 87; Carter, E. P.: Jour. Exper. 



Med., 1914, xx, 21. 



icPeabody, F. W., and Wentworth, J. A.: Arch. Int. Med., 1917, xx, 443. 

 uLewis, T.: Jour. Physiol., 1908, xxxiv, 213, 233. 

 isPorter, W. T.: Jour. Physiol., 1895, xvii, 455. 

 i^Christiaiisen and Haldane, J.: Jour. Physiol., 1914, xlviii, 272. 

 i^Boothby, W. M., and Berry, F. B.: Am. Jour. Physio!., 1915, xxxvii, 433; also 



Boothby, W. M., and Shamoff, V. N.: Ibid., p. 418. 

 isAlcock, N. H., arid Seemann, J. : Jour. Physiol., 1905, xxxii, 30. 

 isScott, F. H.: Jour. Physiol., 1908, xxxvii, 301. 

 "Stewart, G. N., and Pike, F. H.: Jour. Physiol., 190.7, xx, 61. 

 i7aCoombs, H. C., and Pike, F. H.: Proc. Soc. Exper. Biol. Med., 1918, xv, 55. 

 isKrogh, A.: Skand. Arch. f. Physiol., 1910, xxiii, 248; and A. Krogli with Marie 

 Krogh, ibid., 179. 



