536 Length of the Fruit in Oenothera Lamarckiana. 



plant — the culture of seedlings in pots — will be described 

 in the next section. 



§ 4. THE SIMULTANEOUS OPERATION OF NUTRITION 



AND SELECTION. 



The length of the fruits of the large-flowered Even- 

 ing Primrose (Figs. 114 and 115) will afford suitable 



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material with which to gain an insight into the interaction 

 between nutrition and selection. With regard to nutrition 



*The curve is constructed from the tables given in the text by 

 reducing the number of ordinates to one-half. All figures are con- 



