CONTENTS. xi 



PAGE 



rate of the blood- flow. Secondary causes of the circulation, 

 Proofsof the circulation of the blood 233 



CHAPTER XVII. 



THE REGULATION OF THE HEART AND BLOOD-VESSELS BY 

 THE NERVOUS SYSTEM. 



The need of co-ordination in the vascular system. The intrinsic 

 nerves of the heart. Nerves showing the heart's beat. The 

 cardio-inhibitory mechanism. The accelerator nerves of the 

 heart. The nerves of the blood-vessels. The vaso-motor 

 centre. Taking; cold. Vaso-dilator nerves 247 



CHAPTER XVIII. 



THE SECRETORY TISSUES AND ORGANS. 



Definition. Organs of secretion. Glands. Physical processes 

 in secretion. Chemical processes in secretion. The mode of 

 activity of secretory cells. Influence of the nervous system 

 upon secretion. Summary 259 



CHAPTER XIX. 



THE INCOME AND EXPENDITURE C;F THE BODY. 



The material daily losses of the Body. The daily losses of the 

 Body in energy. The conservation of energy. Potential and 

 kinetic energy. The energy of chemical affinity. The relation 

 between matter lost by the Body daily and the energy spent by 

 it. The conditions of oxidation in the living Body. The fuel 

 of the Body. Oxidation by successive steps. The utilization 

 of energy in the living Body. Summary 277 



CHAPTER XX. 



FOODS. 



Foods as tissue-formers. The food of plants. Non-oxidizable 

 foods. Definition of foods. Conditions which a food must 



