The results shown in Tahle Xlll show clearly that 

 alfalfa flowers do sometimes beooiae self -tripped. The 

 figures in this tahle also show that on these two plants a 

 large percentage of the flowers that were self -tripped 

 produced pods and seed. 



By refering to Tahle IV, it will be observed that in 

 each of the three years in which the pollination experi- 

 ments which are summarized in this table were carried out, 

 of those flowers which were not tripped when enclosed in 

 mosquito netting, a small percentage produced pods every 

 year. 



In 1910, nine alfalfa plants which were producing 

 more pods and seed than most of the alfalfa plants in the 

 grass garden at Pullman, wete inclosed in netting tents, 

 and were closely observed for several days to determine 

 whether the small percentage of flowers that frequently 

 produce pods when honey -gat he ring insects are excluded 

 from the alfalfa plants, become self -tripped, or whether 

 the flowers may produce pods without becoming tripped at 

 all. 



The tents in which the plants were enclosed, were 

 carefully covered with fine mesh mosquito -bar , so that 

 there were no openings left for honey -gat he ring insects 



(32) 



