TABLE OF CONTENTS XIX 



.flAPTER 



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 



VIL (OPTIONAL.) ADDITIONAL ANIMAL STUDIES . . 175 



I. Porifera ...... .;.* , 175 



II. Ccelenterata . . . . ' . . :*} . 176 



III. Annelida . . . . . . , . . 179 



IV. Mollusca , T ':., . . . r* ^ . . 181 

 V. Reptiles , < ,,,/ ...... 185 



VI. Mammals . . . ..... 187 



VIL Classification of Animals . . . 190 



HUMAN 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 



m. 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 



VIL Daily Diet . - 60 



