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^> * CONTENTS 



CHAPTER PAGE 



I. THE SCOPE OF BIOLOGY 1 



A. Origin of Life Lore ■ . 2 



B. Biological Sciences 3 



C. Biology and Human Progress 5 



II. CELLULAR ORGANIZATION OF LIFE .... 7 



A. The Cell 9 



B. Cell Division 12 



III. THE PHYSICAL BASIS OF LIFE 14 



A. The Protoplasm Concept 15 



B. Unique Characteristics of Living Matter .... 18 



1. Organization 18 



2. Chemical Composition 20 



3. Metabolism 23 



4. Maintenance and Growth 25 



5. Reproduction 26 



6. Irritability and Adaptation 26 



IV. METABOLISM OF ORGANISMS 30 



A. Green Plants 30 



1. Protococcus 30 



2. Food Making 31 



3. Respiration 33 



B. Animals 35 



1. Amoeba 35 



2. Food Taking 36 



3. Respiration and Excretion 37 



C. Colorless Plants 37 



1. Bacteria 38 



2. Cycle of the Elements in Nature 39 



3. The Hay Infusion Microcosm 43 



V. SURVEY OF UNICELLULAR ANIMALS .... 46 



A. Sarcodina 47 



B. Mastigophora 50 



C. Sporozoa 52 



D. Infusoria 53 



VI. THE MULTICELLULAR ANIMAL 57 



A. Development 57 



B. Tissues 61 



C. Organs and Organ Systems 65 



VII. SURVEY OF INVERTEBRATES 67 



A. Sponges 67 



B. Coelenterates 71 



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