326 



GROWTH OF PLANTS 



Figure 134. 7, Sun- 

 flowers from constant con- 

 dition room grown for 48 

 days with 12 hours' daily- 

 illumination. The figures 

 on the pots are light in- 

 tensities in foot-candles. 



8, Sunflowers from green- 

 house shades June 5 to 

 August 13, 1928. Figures 

 on the pots represent light 

 intensities in percentages 

 of full summer sunhght. 



9, Sunflowers from outside 

 shades June 5 to August 

 20, 1928. Figures on the 

 pots represent hght inten- 

 sities in percentages of full 

 summer sunlight. 



