xii CONTENTS 



CHAPTER 



Fate of Foods in Higher Animals . 

 Role of Oxygen in Metabolism 



Aerobic and Anaerobic Forms . 



Combustion and Respiration . 

 Poisons and Antiseptics ..... 

 Cycle of the Elements in Organic Nature 



The Nitrogen Cycle .... 



Destruction of Organisms 



Putrefactive Organisms . 



Denitrification and Nitrogen Fixation 

 Nature of Energy Transformed 



Movement 



Heat 



Electricity 



Light 



Enzymes and Enzymatic Action 



Internal Secretions and Hormones . 



IV. GROWTH 



Cumulative Integration ..... 

 Amitosis and Mitosis 



Abnormal Mitosis . . . . . 



Nature of the Centrosome 

 Influence of External Conditions on Growth . 



Light and Heat ..... 



Chemical Agents ..... 



V. TISSUE DIFFERENTIATION FOR SPECIFIC FUNCTIONS 



Differentiation in Animals .... 

 - Alimentary System .... 



Sensory Organs, Cephalization 

 Skeletal Structures ..... 



Endoskeleton 



Exoskeleton ..... 



Muscular System 



Circulatory System ..... 

 Excretory Organs ..... 

 Differentiation in Plants .... 

 Plant Movement 



