xii CONTENTS. 



CHAPTER III. 

 On the more General Features of Nervous Tissues. 



PACK 



§ 88. The general arrangement of the nervous system. Cerebro-spinal 

 and splanchnic or sympathetic system ; somatic and splanchnic 

 nerves 139 



§ 89. Grey matter and white matter of the central nervous system. Struc- 

 ture of a nerve cell of the spinal cord ; axis-cylinder process. 

 Functions of nerve cells 143 



§ 90. Keflex actions ; the machinery required. The circumstances deter- 

 mining the nature of a reflex action. Reflex actions often pur- 

 poseful 144 



§ 91. Automatic actions 146 



§ 92. Inhibitory nerves 148 



CHAPTER IV. 



The Vascular Mechanism. 



SECTION I. 



The Structure and Main Features of the Vascular Apparatus. 



§ 93. The chief work of the blood carried on in the capillaries and other 



minute vessels 149 



§ 94. The main features of the vascular apparatus 150 



SECTION II. 



The Main Facts of the Circulation. 



§ 95. Behaviour of arteries contrasted with that of veins . . . 153 



§ 96. Blood pressure in an artery and in a vein 154 



§ 97. Methods of registering blood pressure ; mercurial manometer. 



Kymograph. The blood pressure curve 156 



§ 98. Characters of the blood pressure in various arteries and veins. 

 Blood pressure in the capillaries. Fall of blood pressure in the 

 minute vessels .......... 159 



§ 99. The circulation through the capillaries, and small vessels. Periph- 

 eral resistance 161 



• 



Hydraulic Principles of the Circulation. 



§ 100. The three main physical facts of the circulation ; the central pump, 



the peripheral resistance, and the elastic tubing . . . 163 



