CONTENTS 



PART II. ANIMAL BIOLOGY 



CHAPTER pAGE 



I. Introduction j 



II. Protozoans IO 



III. Sponges .... 



17 



IV. Polyps 22 



V. ECHINODERMS -,, 



VI. Worms , 2 



VII. Crustaceans 5I 



VIII. Insects g, 



IX. Mollusks g 7 



X. Fishes IO g 



XI. Batrachians I2 6 



XII. Reptiles I3 o 



XIII. Birds !r 



XIV. Mammals ^^ 



PART III. HUMAN BIOLOGY 



I. Introduction ! 



II. The Skin and Kidneys 16 



III. The Skeleton 29 



IV. The Muscles , g 



V. The Circulation . . . . . . . .51 



VI. The Respiration y Q 



VII. Food and Digestion 89 



VIII. The Nervous System n 7 



IX. The Senses I42 



X. Bacteria and Sanitation 158 



General Index i 



