xiv CONTENTS 



CHAPTER VIII 

 Metabolism 33 



Definition — Food — Steps in metabolism — Ingestion — Digestion — Absorp- 

 tion — Circulation — Inspiration — Assimilation — Dissimilation — Secretion — 

 Excretion — Expiration — Elimination — Egestion — Respiration — Anabolism 

 and katabolism — Vitamins — Energy changes in metabolism — Uses of differ- 

 ent foods — Storage — Metabolism the central fact in life. 



CHAPTER IX 

 Plants and Animals 41 



Comparison between plants and animals — Biology — Differences between 

 plants and animals. 



CHAPTER X 

 Growth and Reproduction 44 



Growth cycles — ^Limit of size — Reproduction. 



CHAPTER XI 



Mitosis 47 



Normal cell division — Significance of mitosis — Amitosis — Continuity of cell 

 life and chromatin^Growth of the cell. 



CHAPTER XII 



Forms of Animals 52 



Asymmetry — Spherical, or universal, symmetry — Radial symmetry — 

 Bilateral symmetry — Metamerism — Appendages — Homology and analogy. 



CHAPTER XIII 

 Behavior 55 



Stimuli — Direct response — Conductivity — Part played by the nervous sys- 

 tem — Physiological state. 



CHAPTER XIV 



Classification and Nomenclature 58 



Definition — Arrangement of groups of animals — Nomenclature. 



PART II 

 Protozoa 



CHAPTER XV 

 Ameba 63 



Occurrence and appearance — Structure — ^Metabolism — Locomotion — Be- 

 havior — Reproduction. 



CHAPTER XVI 



Paramecium 69 



Occurrence — Structure — Metabolism — Locomotion — Behavior — Reproduc- 

 tion — Con j ugation — Endomixis . 



CHAPTER XVII 

 Protozoa in General 78 



Classification — Mastigophora — Sarcodina — Sporozoa — Infusoria — General 

 facts — Sexual reproduction in protozoa. 



