Stockard : Nectar-glands of Vicia Faba 261 



9. There is evidence to indicate that the cytoplasmic changes 

 are controlled by the nucleus. 



10. The nucleus seems to be the center of metabolic activities 

 participating in the formation of the secretion-substance but play- 

 ing a passive role in the actual process of secretion. 



Department of Botany, 



Columbia University. 



LITERATURE 



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