1010.] 



PUBLIC DOCUMENT — No. 31. 



233 



A comparison of the last three experiments would indicate 

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

 was about equivalent to fifteen minutes' exposure. 



ExPEEIMENT XI. 



Starlight Night Exposures, April 3. 



Fumigation with .01 gram KCN per cubic foot; ])lants 

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

 twelve hours; conclusions drawn after one week. 



Set Numbers. 



Time of exposure, 

 Length of exposure, . 

 Temperature (degrees). 

 Humidity (degrees), . 

 White Si^ine, 

 Hothouse, . 



7.'.'o 

 30 ni. 

 64 



58 



N 

 N 



8.10 

 45 m . 

 62 

 65 



N 

 N 



9.10 

 1 h. 



62 

 66 



N 



N 



Experiment XII. 



Starlight Night Exposures with Older Plants, May 21, 23, 24, 



1907; May 4, U, 1908. 



Fumigation with .01 gram KCN per cubic foot; conclusions 

 drawn after one week. 



