Table of Contents 13 



5. Distinction between Plants and Animals 192 



6. The Cell 193 



7. Structure of the Cell 196 



a. Life Phenomena of the Cell 196 



b. The Germ-cell or Ovum 199 



c. Heredity and Variation 201 



d. Life of the Complex Organism . 202 



e. Disease 203 



/. The Primitive Mind 203 



Section III. THE PRINCIPAL FACTS IN THE HISTORY OF A 



FLOWERING PLANT 204 



1. Physiology of Absorption and Circulation 205 



2. Transpiration, 206 



3. Respiration 206 



4. Assimilation 207 



5. Growth 208 



6. Reproduction 209 



7. Heredity 209 



8. Natural Selection 209 



Section IV. SOME IMPORTANT FACTS IN THE LIFE OF ANIMALS. . 210 



1. Fertilization 211 



2. Segmentation 211 



3. Formation of the Embryo 211 



4. Different Kinds of Eggs 212 



5. Tissues 213 



6. Organs, Systems, and Functions 213 



7. Nutrition 213 



8. Food 214 



9. Digestion 215 



10. Absorption and Circulation 216 



11. The Blood 216 



12. The Circulatory System 216 



13. The Object of the Circulation 217 



14. Assimilation 217 



15. Secretion 218 



16. Excretion 218 



17. Respiration 219 



18. Sensation 220 



19. Sense-organs 221 



20. Development 222 



21. Reflex Action and Instinct 222 



CHAPTER II 



THEORIES OF DEVELOPMENT 



Section V. ORGANIC DEVELOPMENT 223 



1. The Evolution Theory 223 



2. The Interaction Theory 226 



3. The Social Theory ,,,,....,,... 227 



