1910. 



PUBLIC DOCUMENT — No. 31. 



233 



A comparison of tlie last three experiments wonld indicate 

 that, under these conditions, an increase of .005 gram KCN^ 

 was abont equivalent to fifteen iniiiutes' exposure. 



Experiment XI. 

 StarligJd Night Exposures, April 3. 

 Fumigation with .01 gram KCN per cubic foot ; phints 

 eleven days old ; amount of sunlight the day of treatment, 

 twelve hours ; conclusions drawn after one week. 



Experiment XII. 



Starlight Night Exposures with Older Plants, May 21, 23, 2Jf, 

 1907; May 4, H, 1008. 

 Fumigation with .01 gram KCN per cubic foot; conclusions 

 drawn after one week. 



