TalDle XIV shows that 7.7 percent of the flowers 

 ohserved on the nine plants hecame tripped. In several 

 of the flowers the two petals forming: the keel were ot- 

 served to gradually draw apart, and later the flowers 

 were found to "be tripped. As the tents were made so 

 that the honey gathering: insects did not have an oppor- 

 tunity to have access to the flowers, as care was taken 

 to prevent any other ohject from coming into contact 

 with the flowers, it may presumal>ly be assumed that 

 nearly all of the flowers that were tripped were tripped 

 automatically. The evidence obtained from this experiment 

 and also from other experiments conducted at Pullman, 

 Wash, indicate that in most seasons at Pullman, on a 

 large proportion the alfalfa plants, a small percentage 

 of the flowers "become self -tripped; and that a consider- 

 able proportion of the limited numbers of flowers which 

 become self -tripped produce seed. 



In the latter part of August, 1910, alfalfa fields 

 at Chinook, Mont., which were producing seed, were ex- 

 amined, Two fields were found on which pods and seed 

 were developing in unusual abundance. Both fields were 

 profusely in blossom. On August 20 and 21, nearly all 

 flowers that had been open for about one day or more , 

 were tripped. A typical raceme, picked at random was 

 found to have on it twenty opened flowers. Of this number 



(35) 



