CONTENTS. 



CHAPTER XIII. 



THE GENERAL PHYSIOLOGY OP THE NERVOUS SYSTEM 



The properties of nerve tissues. The functions of nerve-centres 

 and nerve-trunks. Excitant and inhibitory nerves. The clas- 

 sification of nerve-fibres. Intercentral nerve-fibres. The 

 stimuli of nerves. General and special nerve stimuli. Specific 

 nerve energies. All nerve-fibres are fundamentally alike. 

 The nature of a nervous impulse. The rate of transmission of 

 a nervous impulse. Functions of the spinal nerve-roots. The 

 intercommunication of nerve-centres ............. . ......... 180 



CHAPTER XIV. 



THE ANATOMY OP THE HEART AND BLOOD-VESSELS. 



General statement. Position of the heart. The membranes of 

 the heart. The cavities of the heart. The heart as viewed 

 from the outside. The interior of the heart. The valves of 

 the heart. The arterial system. The capillaries. The veins. 

 The pulmonary circulation. The course of the blood. The 

 portal circulation. Arterial and venous blood. The structure 

 of arteries, capillaries, and veins. . . ......................... 201 



CHAPTER XV. 



THE WORKING OP THE HEART AND BLOOD-VESSELS. 



The beat of the heart. The cardiac impulse. Events in a cardiac 

 period. Use of the papillary muscles. Sounds of the heart. 

 Function of the auricles. The work done by the heart. The 

 blood flow outside the heart. The circulation as seen with 

 the microscope. Internal friction in the vessels. The conver- 

 sion of an intermittent into a continuous flow 



CHAPTER XVI. 



ARTERIAL PRESSURE AND THE PULSE. 



Weber's schema. Arterial pressure. Modifications of arteriaf 

 pressure, and how they may be produced. The pulse. The 



