Obliteration of Effect of Nutrition by Selection. 569 



terminal heads; and found the figures given in the table 

 on this page. 



Here again as in Chrysanthemum and Coreopsis there 

 was no marked effect on the curve while nutrition and 

 selection were operating in opposite directions. 



BIDENS GRANDIFLORA. 



From which I have calculated the following values 



§ 8. OBLITERATION OF THE EFFECT OF NUTRITION 



BY SELECTION. 



The experiment was carried out partly with Corxan- 

 drum sativum, the common Coriander, and partly with 

 Madia elegans, as species related to the oil Madia (Madia 

 sativa). 



The seeds of the former were obtained from MM. 



