CONTENTS Xli 



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XI 



MECHANICS OF RESPIRATION 



Page 

 MECHANICS OF RESPIRATION . 505 



Artificial scheme Inspiration Expiration Normal 

 respiration Forced respiration Obstructed air pas- 

 sages Asphyxia Coughing ; sneezing Hiccough 

 Perforation of the pleura. 



XII 

 THE CIRCULATION OF THE BLOOD 



THE MECHANICS OF THE CIRCULATION 508 



Circulation scheme. 



THE CONVERSION OF THE INTERMITTENT INTO A CON- 

 TINUOUS FLOW 515 



THE RELATION BETWEEN RATE OF FLOW AND WIDTH 



OF BED 519 



THE BLOOD-PRESSURE 521 



Kelation of peripheral resistance to blood-pressure 

 Curve of arterial pressure in the frog Effect on blood- 

 pressure of increasing the peripheral resistance in the 

 frog Changes in the stroke of the pump; inhibition 

 of the ventricle Effect of inhibition of the heart on 

 the blood-pressure in the frog. 



THE HEART AS A PUMP 525 



Opening and closing of the valves Period of outflow 

 from the ventricle Sphygmograph tambour Visible 

 change in form Graphic record of ventricular contrac- 

 tion. , 

 THE HEART MUSCLE 530 



All contractions maximal Staircase contractions Iso- 

 lated apex ; Bernstein's experiment Rhythmic con- 

 tractility of heart muscle Constant stimulus may cause 

 periodic contraction Inactive heart muscle still irri- 

 table Refractory period; extra-contraction; compen- 

 satory pause Transmission of the contraction wave 

 in the ventricle ; Engelmann's incisions Transmission 



