1910.] 



PUBLIC DOCUMENT — No. 31. 



219 



In this experiment it wonld seem that phmts which had been 

 ' shaded for a time before the treatment, by being placed under 

 the benches, were at a slight advantage. 



Experiment VI. 

 Niglit Exposures, December llj. 



Fumigation wdth .01 gram KCN per cubic foot; plants six 

 weeks old; house humidit}', 79° ; five hours of sunlight the day 

 of treatment ; dark during treatment of first two sets, moon- 

 light during the last three ; treatment began on set 1 as soon as 

 it was really dark; plants watered at 8.30 a.:\[.^ dry when 

 treated ; half the plants of each variety had been placed under 

 the bench for twenty-four hours before treatment; conclusions 

 Irawn three weeks after the treatment. 



Set Numbers. 



ime of exposure, . 



angth of exposure, 

 ^»mperature of house (degrees), 

 MViugston normal, . 

 divingston under bench, . 



/orillard normal, 



lorillard under bench, . 



reedom normal, 



reedom under bench. 



5.20 

 10 m. 

 55 

 C 

 N 

 N 

 N 

 N 

 N 



7.20 

 20 m . 

 58 

 TI 



N 

 C 

 N 

 C 



8.30 

 30 m. 



62 

 



X 



c 



X 



c 



9.30 

 45 m. 

 60 

 C 

 C 

 C 



10.45 

 1 h. 



58 



, 1903) 

 |t gram 

 .ost stages 

 intervals of 



