CONTENTS. IX 

 CHAPTER XII. 



PAGE 



SECRETION, 313 



Secreting Membranes, ........ 314 



Serous Membranes, 315 



Mucous Membranes, 316 



Secreting Glands, ........ 319 



Process of Secretion, 321 







CHAPTER XIII. 



VASCULAR GLANDS, OR GLANDS WITHOUT DUCTS, . . . 325 



Structure of the Spleen, 327 



Functions of the Vascular Glands, ..... 329 



CHAPTER XIV. 



THE SKIN AND ITS SECRETIONS, 332 



Structure of the Skin, 333 



Structure of Hair and Nails, ...... 340 



Excretion by the Skin, 344 



Absorption by the Skin, ....... 347 



CHAPTER XV. ^ 



THE KIDNEYS AND THEIR SECRETION, 349 



Structure of the Kidneys, ....... 349 



Secretion of Urine, ........ 354 



The Urine ; its General Properties, . . . . . 356 



Chemical Composition of the Urine, . . . . - . 357 



CHAPTER XVI. 



THE NERVOUS SYSTEM, ........ 367 



Elementary Structures of the Nervous System, . . . 368 



Functions of Nerve-fibres, . . . . . . . 376 



Functions of Nerve-centres, ...... 382 



CEREBRO-SPINAL NERVOUS SYSTEM, ..... 386 



Spinal Cord and its Nerves, 386 



Functions of the Spinal Cord, 392 



