CONTENTS. XV 11 



CHAPTER XXI. 



SECRETIONS. 



PAGE 



Lachrymal Glands, 377 



Mucous Glands, 378 



Sebaceous Glands, 380 



Mammary Glands, 381 



Composition of Milk, 383 



y Sudoriferous Glands, 386 



Cutaneous Desquamation, 388 



CHAPTER XXII. 



URINARY EXCRETION. 



/Structure of the Kidneys, 390 



> Blood Vessels of the Kidneys, 392 



,* Urine,- 394 



^ Method of Secretion of the Uiii.e, 396 



Chemical Composition of the Urine, 400 



.xUrea, 400 



Uric Acid, '. 402 



Kreatinin, Xanthin, Hippuric Acid, elc., 403 



Coloring Matters and Inorganic Salts, 404 



Abnormal Constituents, 405 



Urinary Calculi, 407 



Source of Urea, etc., 407 



Nervous Mechanism of the Urinary Secretion, 410 



Outflow of Urine, 410 



.-Nervous Mechanism of Micturition, 413 



CHAPTER XXIII. 



NUTRITION. 



Tissue Changes during Starvation, 417 



Requirements, 419 



Ultimate Uses of Food Stuffs, 425 



CHAPTER XXIV. 



ANIMAL HEAT. 



Warm- and Cold-blooded Animals, 428 



Variations in the Body Temperature, 429 



* 



