1910.] 



PUBLIC DOCUMENT — No. 31. 



229 



A comparison of the last two experiments shows how much 

 less sensitive cucumbers are in cloudy weather. 



ExPEKIMENT III. 



Cloudy Day Exposures with Older Plants, April 26, 29, 



May 8, 16. 



Fumigation with .01 gram IvCN per cul)ic foot; sunlight 

 a jiortion of each day, but not during treatment; plants watered 

 the day before the treatment ; conclusions drawn after one week. 



Experiment IV. 



Cloudy Bay Exposures with Stronger Fumigation, May 23, 27. 



Fumigation with .015 gram KCN per cubic foot; plants 



of first two sets sixteen days old, fumigated May 23 ; of the 



other sets twenty days old, fumigated May 27; amount of sun- 



