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The Behavior of the Nucleoli during Oogenesis of 

 the Dragon-fly with Especial Eeference to Synapsis. 



By 



Caroline McGill. 



With plates 13-15. 



Contents, 

 I. Introduction. 

 II. Literature Review. 



1. Origin of Nucleoli. 



2. Double Nucleoli. 



3. Origin of .Small Nucleoli from Large. 



4. Derivation of Chromatin from the Nucleolus. 



5. Discharge of Nucleolar Material from Resting Nuclei. 



6. Function of the Nucleolus. 



7. Relation of the Nucleolus to Synapsis. 



III. Material and Methods. 



IV. The Ovaries. 



V. The Egg-strings. 



1. The End-filaments. 



2. The (Terminal Area. 



a) Follicle-cells. 



b) Grerm-cells. 



3. The Growth Area. 



a) In Plaihoniis lydia. 



(a) The Nucleoli. 



(b) The Yolk-nuclei. , 



