Growth in Eriogonum nudum 



235 



changes in the amount of illumination would have. Temperature con- 

 ditions were not controlled; nor was it necessary since the varying con- 

 ditions afforded fluctuations in both directions, so that the data which 

 follow offer fairly conclusive evidence that the maximum possible 

 illumination to which the plant is normally exposed to in its environ- 

 ment is itself without direct effect in limiting or reducing growth. The 

 records of the following days are now considered. 



Figure 11. Curves of total growth for August 26 and 30. 



35 



red screen 

 at 13.30 



blue screen 24 

 at 13 

 33 40 



normal conditions 60 

 restored at 16.05 



65 



Growth proceeded after previous cessation on placing the uviol glass 

 screen, thus raising the temperature without altering the illumination. 

 This might of course have occurred in any event. 



50 10 60 

 66 26 26 



