1910.] 



PUBLIC DOCUMENT —No. 31. 



243 



Experiment XXXI. 

 Cloudy Night Exposures ivith Still Older Plants, May 9, IS. 

 Fumigation with .02 gram KCN per cubic foot ; plants 

 of the first five sets, fifty-one days old ; of sixth set, thirty-eight 

 davs old ; conclusions drawn after one week. 



Experiment XXXII. 

 Cloudy Night Exposures with Stronger Fumigation, May 21. 

 Fumigation with .03 gram KCN per cubic foot ; plants 

 twenty days old ; no sunlight the day of treatment ; conclu- 

 sions drawn after one week. 



