16 Contents 



CHAPTER PAGE 



Bioluminescence and Light _____________ 762 



Bioelectric Phenomena ______________ 764 



Enzymes __________________ 766 



Plant and Animal Hormones, Including the Ductless (Endocrine) 



Gland Secretions _______________ 767 



Vitamins __________________ 769 



Toxins, Split Proteins, Antibodies, and Hypersensitiveness (Allergies) _ 772 



38. Applied Biology _______________ 775 



Biology and Its Relation to Agriculture and Hydroponics _ _ _ _ 775 



Biology and Its Relation to Foods, Clothing, Furniture, and Fuels _ _ 776 

 Biology and Its Relation to Human Welfare ________778 



Medicine and Health _____________ 778 



Biology and Wealth ______________ 779 



Water Supplies and Sewage Disposal _________ 781 



Diseases Caused or Transmitted by Animals ________ 784 



Human Diseases _______________ 784 



Diseases of Animals Other Than Human ________ 786 



Diseases Produced by Plants ____________ 789 



Diseases Caused by Viruses _____________ 789 



39. Conservation of Natural Resources _________ 792 



Destruction and Conservation of Forests _________ 793 



Loss and Conservation of Soils ____________ 794 



Loss and Conservation of Water ___________ 795 



Loss and Conservation of Animal and Plant Wild Life _____ 796 



Loss and Conservation of Minerals and Fuels _______ 797 



Conservation of Human Resources ___________ 797 



40. Biologists and Their Work ___________ 800 



History and Development of Biology __________ 800 



How Scientists Have Solved Problems _________ 804 



PART 5 



APPENDIX __________________ 807 



Important Prefixes and Suffixes Used in Biology _______ 807 



Glossary, Biologic Principles, and Theories _ _ _ _ _ _ _ _ 813 



New and Old Systems of Classifying Plants Contrasted _____ 865 



