234 



EXPERIMENT STATION. 



[Jan. 



Set Numbers. 



Experiment XIII. 



Starlight Night Exposures with Still Older Plants, April 15, 



October 7, November ^. 



Fumigation with .01 gram KCX per cubic foot; plants 

 of first five sets, five weeks old ; of the sixth and seventh sets, 

 four weeks; of the eighth and ninth sets, thirtv-two days; con- 

 clusions drawn after one week. 



Experiment XIV. 



Starlight Night Exposures with Old Plants, May 20, 23, 31, 



June 7, 17. 

 Fumigation with .01 gram IvCX per cubic foot; entire 

 greenhouse full of plants used in each exposure; conclusions 

 drawn after one week. 



