CONTENTS. 
XI 
CHAPTER VI 
PAGE 
Op Respiration.258 
NATURE OF THE CHANGES ESSENTIALLY CONSTITUTING 
RESPIRATION.259 
STRUCTURE AND ACTIONS OP THE RESPIRATORY APPARATUS 265 
CHAPTER VII. 
Op Excretion and Secretion.292 
GENERAL PURPOSES OP THE EXCRETING PROCESSES . . lb. 
NATURE OP THE SECRETING PROCESS.—STRUCTURE OP THE 
SECRETING ORGANS.298 
5 CHARACTERS OP PARTICULAR SECRETIONS.304 
CHAPTER VIII. 
General Review op the Nutritive Operations.—Formation 
op the Tissues.316 
GENERAL REVIEW OP THE NUTRITIVE OPERATIONS . . lb. 
FORMATION OP THE TISSUES.317 
REPAIR OP 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 OP THE NERVOUS SYSTEM IN THE 
PRINCIPAL CLASSES OP ANIMALS.350 
FUNCTIONS OP THE SPINAL CORD.—REFLEX ACTION . . 374 
FUNCTIONS OP THE GANGLIA OP SPECIAL SENSE.—CON¬ 
SENSUAL ACTIONS.380 
FUNCTION OP THE CEREBELLUM.—COMBINATION OF MUS¬ 
CULAR ACTIONS.384 
FUNCTION OF THE CEREBRUM.-- INTELLIGENCE AND WILL . 385 
