CONTENTS 



I. Body Size as Structure and as Func- 

 tion 1 



Size a Regulated Characteristic 1 



Metabolic Turn-Over 6 



Some Theoretical Points 12 



II. Rates of Growth of Individuals 18 



Paramecium 18 



Other Species 27 



Various Influences upon Growth in Size 35 



III. Variability of Body Size 42 



Variability and Its Measurement 42 



Correlatives of Body Volume 50 



IV. Inheritance of Size 54 



Paramecium 54 



Other Soft-Bodied Species 59 



Shelled Rhizopods 64 



V. The Rate of Multiplication 72 



Environmental Factors 72 



Internal Factors 75 



Inhibition of Reproduction 77 



VI. Size in Relation to Multiplication 



Rate 87 



Growth as a Prerequisite to Reproduc- 

 tion 87 



Regeneration and Reproduction 92 



Regenerating Capacity and Size 94 



VII. The Fusion of Individuals 98 



Agamic Fusion 98 



The Conditions for Conjugation 104 



Cannibalism 105 



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