CONTENTS. xiii 



PAGE 



366. The effects of inflation and suction. Double action of the vagus 



fibres. Self-regulating mechanism ...... 592 



$ 367. The nature of the action of the centre 596 



368. The influence on the respiratory centre of various afferent impulses . 596 



369. The respiratory centre composed of two lateral halves . . . 598 

 g 370. The respiratory centre influenced by the condition of the blood 



brought to it. Eupncea, Hyperpncea and Dyspnoea . . . 598 

 371. The direct character of these influences. Effects of heat on the 



respiratory centre ......... 599 



372. The relative shares taken by deficiency of oxygen and excess of 



carbonic acid in the above influences ...... 600 



373. Changes in the blood other than differences in the gases influence 



the respiratory effect. The effects of muscular exercise . . 602 



374. The phenomena and causes of apnoea 603 



375. Secondary respiratory rhythm. The Cheyue-Stokes respiration . 605 



SECTION VIII. 

 THE EFFECTS OF CHANGES IN THE COMPOSITION AND PRESSURE 



OF THE AlR BREATHED. 



jg 376. The phenomena of asphyxia 60b 



377. The effects of breathing oxygen 609 



. 378. The effects on respiration of breathing various foreign gases . . 609 



J 379. The effects of a diminution of pressure in the air breathed . . 610 



. 380. The effects of an increase of atmospheric pressure .... 611 



SECTION IX. 



THE RELATIONS OF THE RESPIRATORY SYSTEM TO THE VASCULAR 



AND OTHER SYSTEMS. 



. 381. The respiratory movements influence the circulation. The respiratory 



undulations of the blood-pressure curve 613 



382. The effects of the expansion of the thorax and its return on the 

 flow of blood to and from the heart and so on the blood- 

 pressure 615 



383. The effects of the expansion and return of the thorax on the flow of 



blood through the lungs 618 



. 384. The effects on the circulation of artificial respiration . . . 619 



4; 385. An action of the cardio-iuhibitory centre synchronous with that of 



the respiratory centre 620 



<i 386. The effects of impeded respiration on the action of the heart . . 621 



387. The effects of impeded respiration on the circulation in general. 



Traube-Hering curves 622 



388. The circulation in asphyxia 624 



389. The effects on respiration of changes in the circulation through the 



respiratory centre and through the lungs 626 



. 390. The effects of exercise on respiration 627 



