CONTROLLED ENVIRONMENTAL CONDITIONS 



327 



Figure 135. 13, Geum 

 plants grown in constant 

 condition room for 54 

 days with 12 hours' daily 

 illumination. Figiu-es on 

 the picture show the 

 hght intensities in foot- 

 candles. 14, Sunflower 

 plants grown in the spec- 

 tral house shades from 

 June 5 to August 15, 1928. 

 The Arabic figures on the 

 pots show light intensities 

 in percentages of outside 

 sunlight. Roman numer- 

 als show the house num- 

 ber. 15, Gevm plants 

 grown in the spectral 

 house shades from July 

 10 to October 24, 1928. 

 Arabic figiires show hght 

 intensities. Roman nu- 

 merals show the house 

 numbers. 16, Galinsoga 

 plants grown in spectral 

 house shades from May 30 

 to July 5, 1928. Arabic 

 figures show hght intensi- 

 ties. Roman numerals 

 show house numbers. 



