CONTENTS 



List of Abbreviations xxvii 



I. General Considerations By Gary N. Calkins, Pro- 

 fessor Emeritus of Protozoology in Residence, Co- 

 lumbia University .... 3 



Life and vitality — Fundamental and derived organiza- 

 tion — Some ecological considerations — Some historical 

 facts — The use of cultures — Factors influencing longev- 

 ity — Changes with metabolism — Reorganization of the 

 macronucleus and other derived structures in Ciliata — 

 Reorganization by endomixis and by conjugation — Lit- 

 erature cited 



IL Some Physical Properties of the Protoplasm of the 

 Protozoa By H. W. Beams and R. L. King, State 

 University of loiva 43 



Introduction — Properties of protoplasm as exhibited in 

 Amoeba— Colloidsil nature of protoplasm — Consist- 

 ency — Surface properties — Specific gravity or density — 

 Optical properties — Structural properties — Literature 

 cited 



in. Cytoplasmic Inclusions By Ronald F. MacLennan, 



Oberlin College Ill 



Mitochondria — The vacuome hypothesis — Digestive 

 granules — Segregation granules — Golgi bodies — Excre- 

 tory granules — Lipoid reserves — Carbohydrate reserves — 

 Protein reserves — External secretion — The granular com- 

 plex — The continuity of cytoplasmic granules — The 

 classification of cytoplasmic granules — Comparison with 

 cells of the Metazoa — Literature cited 



IV. Fibrillar Systems in Ciliates By C. V. Taylor, Stan- 

 ford University 191 



Introduction — Examples of fibrillar systems — Structural 



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