x CONTENTS. 



PAGE 



Sec. 4. The Muscle-Nerve Preparation as a Machine . . . . 83 



The nature and mode of application of the Stimulus as affecting 

 the amount and character of the Contraction, p. 83. The influence 

 of the Load, p. 87. The influence of the Size and Form of the 

 Muscle, p. 88. The work done, p. 89. 



Sec. 5. The Circumstances which determine the Degree of Irritability of 



Muscles and Nerves 90 



The effects of severance from the Central Nervous System, p. 91. 

 The Influence of Temperature, p. 93. The Influence of Blood 

 Supply, p. 94. The Influence of Functional Activity, p. 95. 



Sec. 6. The energy of Muscle and Nerve, and the nature of Muscular and 



Nervous Action 98 



Sec. 7. Other forms of Contractile Tissue 101 



Unstriated Muscular Tissue, p. 101. Cardiac Muscles, p. 102. 

 Cilia, p. 102. Migrating Cells, p. 103. 



CHAPTER III. 



THE FUNDAMENTAL PROPEETIES OF NERVOUS TISSUES, pp. 104 114. 



Automatic actions, p. 107. Eeflex actions, p. 109. Actions of 

 sporadic ganglia, p. 112. Inhibition, p. 113. 



CHAPTER IV. 



THE VASCULAR MECHANISM, pp. 115 230. 



I. THE PHYSICAL PHENOMENA OF THE CIRCULATION .... 116 

 Sec. 1. Main general facts of the Circulation 117 



The Capillary Circulation, p. 117. The flow in the Arteries, p. 120. 

 The flow in the Veins, p. 127. Hydraulic principles of the Circu- 

 lation, p. 128. 



Sec. 2. The Heart 135 



The Phenomena of the Normal Beat, p. 135. The Mechanism of 

 the Valves, p. 142. The Sounds of the Heart, p. 143. On the 

 relative duration and special characters of the cardiac events, 

 p. 146. The work done, p. 157. Variations in the Heart's Beat, 

 p. 159. 

 Sec. 3. The Pulse 161 



n. THE VITAL PHENOMENA OF THE CIRCULATION .... 176 



Sec. 4. Changes in the Beat of the Heart 178 



The Mechanism of the normal beat, p. 180. Inhibition of the 

 beat, p. 184. The effects on the circulation of changes in the 

 heart's beat, p. 194. 



