CONTENTS 



I. INTRODUCTORY THE DISTINCTIVE CHARACTERS OF THE PROTOZOA 



AND OF THEIR PRINCIPAL SUBDIVISIONS . - 1 12 



II. THE MODES OF LIFE OF THE PROTOZOA ... 13 28 



The Four Types of Nutrition, 13-15 ; Problems of Parasitism 

 15-28. 



HI. THE ORGANIZATION OF THE PROTOZOA EXTERNAL FORM AND 



SKELETAL STRUCTURES .... 29 39 



IV. THE ORGANIZATION OF THE PROTOZOA (continued) THE PROTO- 

 PLASMIC BODY - ..... 40 44 



V. THE ORGANIZATION OF THE PROTOZOA (continued) DIFFERENTIATIONS 



or THE ECTOPLASM AND ENDOPLASM ... 45 64 



A. Ectoplasmic Organs (1) Protective, 45 ; (2) Kinetic and 

 Locomotor, 46 ; (3) Excretory, 60 ; (4) Sensory, 61. 



B. Endoplasmic Organs, 62. 



VI. THE ORGANIZATION OF THE PROTOZOA (continued) THE NUCLEAR 

 APPARATUS CHROMATIN, NUCLEUS, CHROMIDIA, CENTRO- 

 SOMES, AND BLEPHAROPLASTS - - 65 99 



VII. THE REPRODUCTION OF THE PROTOZOA- - . - 100 124 



Types of Fission, 100 ; Division of the Nucleus, 101 ; Division 

 of the Cell-Body, 122. 



VIII. SYNGAMY AND SEX IN THE PROTOZOA - - 125 161 



Nature of the Sexual Process, 125 ; Occurrence of Sexual 

 Phenomena and their Importance in the Life of the Organism, 

 128 ; Maturation and Reduction, 142 ; Examples of Syngamy 

 and Reduction in Protozoa, 147 ; Theories of the Origin and 

 Significance of the Syngamic Process, 154. 



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