PART II. SPECIAL PHYSIOLOGY. 



C. The Circulation. 



XVII. The Circulation and its Ultimate Cause. .. 85 



a. The Capillary Circulation. 



b. To Observe the Action of the Frog's 

 Heart. 



XVIII. The Graphic Record of the Frog's Heart 



Beat 89 



XIX. The Apex Beat. The Heart Sounds. The 



Cardiograph 91 



XX. The Flow of Liquids through Tubes. Lat- 

 eral Pressure 93 



XXL The Flow of Liquids through Tubes under 

 the Influence of Intermittent Pressure. 

 The Impulse Wave; Graphic Tests .... 98 

 XXII. The Laws of Blood Pressure Determined 

 from an Artificial Circulatory System. 

 Pulse Tracing from the Artificial System. 102 



XXIII. The Human Pulse. The Sphygmograph. 



The Sphygmogram 106 



XXIV. To Determine the General Influence of the 



Vagus Nerve upon the Circulation 109 



D. Respiration. 

 XXV. a. External Respiratory movements 113 



b. Intra-thoracic Pressure. 



c. Intra-abdominal Pressure. 



XXVI. Respiratory movements in Man 117 



a. The Stethograph. 



b. The Thoracometer. 



c. The Belt-Spirograph. 



d. The Stethogoniometer. 



