228 



EXPERIMENT STATION. 



[Jan. 



introduction, bnt the work itself, the daily care and observa- 

 tions were made by Dr. Hooker, and the conclusions drawn are 

 mainly his. For some editorial work on all the parts the writer 

 is responsible. Abbreviations indicating the results are the 

 same as those used for the tomato, which are explained on 

 page 215. All the plants used were watered the day of the 

 experiment, but their leaves were dry in all cases unless other- 

 wise noted. 



Experiment I. 

 Day Exposures with Direct Sunlight, April Jf. 

 Fumigation with .01 gram KCIST per cubic foot; plants nine 

 days old ; amount of sunlight the day of treatment, ten hours ; 

 conclusions drawn after three days. 



Set Numbers. 



8 



Time of exposure, . 

 Length of exposure, 

 Temperature (tlegrces). 

 Humidity (degrees), 

 White Spiue, 

 Hothouse, . . . 



9.00 

 10 I a. 

 94 

 47 



N 

 N 



9.25 

 20 m. 

 94 

 40 



BB 



BB 



10.00 

 30 m. 

 108 

 41 

 B 

 VBI 



10.50 



45 m. 

 107 



45 



B 

 BB 



12.00 

 1 h. 

 115 



47 

 BB 

 BB 



It is evident that, under these conditions, treatment long 

 enough to be of any value against insects would seriously in- 

 jure the plants. 



Experiment II. 



Cloudy Day Exposures, May G, 7. 



Fumigation with .01 gram KCN per cubic foot; plants 



of sets 1 to 5, ten days old ; of set G, seventeen days old ; no 



sunlight the day of treatment; conclusions drawn after one 



week. 



