CONTENTS. 



CHAPTER I. 



GENERAL ORGAXIZATIOX OF THE PROTOZOA. 



A. General Morphologj' 18 



Protoplasmic Structure . . . '. 21 



Membranes, Shells, and Tests 22 



Plastids 26 



Vacuoles and their Functions 28 



Nuclei, Chromatin, and Chromidia 28 



Kinoplasm 29 



B. Organs of Locomotion and Classification 34 



Pseudopodia and Classification of the Sarcodina 35 



Flagella and Classification of the Mastigophora 42 



Cilia and Classification of the Infusoria 49 



Parasites and Classification of the Sporozoa ........ 56 



CHAPTER II. 



PHYSIOLOGICAL ACTIVITIES OF THE PROTOZOA. 



Food-taking and Digestion 71 



Excretion .' 83 



Irritabilitj- .' 84 



Growth and Reproduction 87 



Division 88 



Budding 92 



Sporulation 96 



CHAPTER III. 



PROTOPLASMIC AGE OF PROTOZOA. 



A Typical Life Cycle 104 



Youth, Maturity, and Age 110 



The Period of Youth Ill 



Changes at Maturity 113 



Idiochromidia 118 



Sex Differentiation 120 



Old Age 127 



