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. DlGKSTION 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 



