CONTENTS. IX 



CHAPTER X. 



PAGE 



ANIMAL HEAT 309 



Variations in Bodily Temperature 809 



' Sources of Heat 311 



' Loss of Heat 313 



Production of Heat 315 



Inhibitory Heat-centre 316 



CHAPTER XI. 



SECRETION 317 



SECRETING MEMBRANES 319 



SEROUS MEMBRANES 319 



Mucous MEMBRANES . 321 



SECRETING GLANDS 322 



PROCESS OP SECRETION 324 



CIRCUMSTANCES INFLUENCING SECRETION 326 



MAMMARY GLANDS AND THEIR SECRETION ...... 328 



CHEMICAL COMPOSITION OF MILK 331 



CHAPTER XII. 



THE SKIN AND ITS FUNCTIONS 333 



Structure of the Skin 333 



Sudoriparous Glands ........... 337 



Sebaceous Glands ............ 339 



Structure of Hair 339 



Structure of Nails 341 



Functions of the Skin 342 



CHAPTER XIII. 



THE KIDNEYS AND URINE 347 



Structure of the Kidneys 347 



Structure of the Ureter and Urinary Bladder 354 



The Urine 355 



The Secretion of Urine 365 



Micturition . 373 



