TABLE OF CONTENTS XIX 



CHAPTEB PAGE 



V. CRAYFISHES AND THEIR RELATIVES 151 



VI. PARAMECIUM AND ITS RELATIVES 164 



I. Structure and Functions of Paramecium . . 164 



II. Structure and Functions of Amoeba . . . 170 



III. Cellular Structure of Higher Animals . . .172 



IV. Importance of Protozoa to Man .... 173 



VII. (OPTIONAL.) ADDITIONAL ANIMAL STUDIES . . 175 



I. Porifera 175 



II. Ccelenterata 176 



III. Annelida 179 



IV. Mollusca 181 



V. Reptiles 185 



VI. Mammals 187 



VII. Classification of Animals 190 



BIOLOGY 



I. GENERAL STRUCTURE OF THE HUMAN BODY . . 1 



II. MICROORGANISMS AND THEIR RELATION TO HUMAN 



WELFARE 10 



I. Structure and Functions of Bacteria ... 10 



II. Occurrence of Bacteria 14 



III. Bacteria as the Friends of Man .... 20 



IV. Bacteria as the Foes of Man .... 23 



III. FOODS AND THEIR USES 44 



I. Food Substances found in the Human Body . 44 



II. The Necessity for Foods 45 



III. The Composition of Foods 46 



IV. Uses of the Food Substances .... 50 

 V. Cooking of Foods 52 



VI. Food Economy ....... 56 



VII. Daily Diet 60 



