The results of the experiment show that when insects 

 were excltxded from the plants, the percentage of flowers 

 from which pods developed was verj'- much less than from the 

 flowers on the same plants which were left open to the 

 access of insects. The percentage of flowers that were 

 tripped, and the percentage of flowers from which pods 

 developed was only verj'' slightly grea^ter on those plants 

 which were open to the access of insects at night, than on 

 the plants from which insects were excluded during the 

 entire time of the experiment. The results ohtained in- 

 dicate that night-flying insects are of practically no 

 importance, as a factor influencing the production of 

 alfalfa seed at Pullmjan. 



(50) 



