CONTENTS. xv 



PAGE 



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



fibres. Self-regulating mechanism 623 



367. The nature of the action of the centre 627 



368. The influence on the respiratory centre of various afferent impulses . 627 



369. The respiratory centre composed of two lateral halves . . . 629 

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



brought to it. Eupnoea, Hyperpncea and Dyspnoea . . . 629 



371. The direct character of these influences -$80- 



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



carbonic acid in the influences 632 



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



the respiratory effect. The effects of muscular exercise . . 633 



374. The phenomena and causes of apnoea 635 



375. Secondary respiratory rhythm. The Cheyne-Stokes respiration . 637 



SECTION VIII. 

 THE EFFECTS OF CHANGES IN THE COMPOSITION AND PRESSURE 



OF THE AlR BREATHED. 



376. The phenomena of asphyxia 638 



377. The effects of breathing oxygen 641 



378. The effects on respiration of breathing various foreign gases . . 641 



379. The effects of a diminution of pressure in the air breathed . . 641 



380. The effects of an increase of atmospheric pressure .... 643 



SECTION IX. 



THE KELATIONS 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 645 



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 647 



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



blood through the lungs 650 



384. The effects on the circulation of artificial respiration . . . 651 

 385. An action of the cardio-inhibitory centre synchronous with that of 



the respiratory centre . . . . . . . . 652 



386. The effects of asphyxia on the vascular system, under urari . . 653 



387. The same without urari 656 



388. Traube-Hering curves 657 



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



respiratory centre and through the lungs 658 



390. The effects of exercise on respiration 659 



