234 



EXPERIMENT STATION. 



[Jan. 



Experiment XIII. 



Starlight Night Exposures ivitli Still Older Plants, April 15, 

 October 7, November J^. 



Fuiiiigation with .01 gram KCN per cubic foot; plants 

 of first five sets, five W'Ceks old ; of the sixth and seventh sets, 

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

 clusions drawn after one week. 



Experiment XIV. 



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



June 7, 17. 

 b'liiuigation with .01 gram KCN per cubic foot; entire* 

 greenhouse full of plants used in each exposure; conclusions 

 drawn after one week. 



