CONTENTS. XI 



CHAPTER VI 



PAGE 



OF RESPIRATION 258 



NATURE OP THE CHANGES ESSENTIALLY CONSTITUTING 



RESPIRATION 259 



STRUCTURE AND ACTIONS OF THE RESPIRATORY APPARATUS 265 



CHAPTER VII. 



OF EXCRETION AND SECRETION 292 



GENERAL PURPOSES OF THE EXCRETING PROCESSES . . ib. 

 NATURE OF THE SECRETING PROCESS. STRUCTURE OF THE 



SECRETING ORGANS 298 



CHARACTERS OF PARTICULAR SECRETIONS 304 



CHAPTER VIII. 

 GENERAL REVIEW OF THE NUTRITIVE OPERATIONS. FORMATION 



OF THE TISSUES 316 



GENERAL REVIEW OF THE NUTRITIVE OPERATIONS . . ib. 



FORMATION OF THE TISSUES 317 



REPAIR OF INJURIES 323 



CHAPTER IX. 



ON THE EVOLUTION OF LIGHT, HEAT, AND ELECTRICITY BY 



ANIMALS 327 



ANIMAL LUMINOUSNESS ib. 



ANIMAL HEAT 332 



ANIMAL ELECTRICITY 340 



CHAPTER X. 



FUNCTIONS OF THE NERVOUS SYSTEM 345 



STRUCTURE AND ACTIONS OF THE NERVOUS SYSTEM IN THE 



PRINCIPAL CLASSES OF ANIMALS 350 



FUNCTIONS OP THE SPINAL CORD. REFLEX ACTION . . 374 

 FUNCTIONS OF THE GANGLIA OF SPECIAL SENSE. CON- 

 SENSUAL ACTIONS 380 



FUNCTION OF THE CEREBELLUM. COMBINATION OF MUS- 

 CULAR ACTIONS 384 



FUNCTION OF THE CEREBRUM.- INTELLIGENCE AND WILL . 385 



