1910.] 



PUBLIC DOCUMENT — No. 31. 



235 



ExPEKIMENT XV. 



Starliglit Night Exposures with Stronger Fumigation, April 11. 

 Fumigation with .015 gram KCN per cubic foot; plants 

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

 eleven and a half hours ; conclusions drawn after one week. 



Set Numbers. 



3 



3 



Time of exposure. 

 Length of exposure, . 

 Temperature (degrees). 

 Humidity (degrees), . 

 White spine. 

 Hothouse, . 



7.00 

 30 m . 

 70 

 .59 

 X 

 N 



7.45 

 45 m. 

 69 

 63 



N 



8.45 

 1 h. 



69 



63 



N 



N 



Experiment XVI. 



Starliglit Night Exposures with Older Plants or Longer Ex- 

 posures. 



Fumigation with .015 gram KCN per cubic foot; amount 

 of sunlight May 13, nearly twelve hours; not taken on the other 

 days; conclusions drawn after one week. 



