12 CONTENTS 



CHAPTER PAGE 



XXII. THE VERTEBRATE ANIMALS 274 



FISHES 275 



AMPHIBIA. THE FROG 285 



REPTILES 293 



BIRDS . 297 



MAMMALS 311 



XXIII. MAN, A MAMMAL . . 319 



XXIV. FOODS AND DIETARIES 330 



XXV. DIGESTION AND THE ABSORPTION 352 



XXVI. THE BLOOD AND ITS CIRCULATION 366 



XXVII. RESPIRATION AND EXCRETION 382 



XXVIII. THE NERVOUS SYSTEM AND ORGANS OF SENSE . . 399 



XXIX. HEALTH AND DISEASE A CHAPTER ON Civic BIOLOGY 418 



INDEX 437 



