flowers, from which insects were excluded, had hecome 

 tripped. On one of these two plants,- plant numhered Mont- 

 ana B,- in a nurnber of the flowers the keel petals were 

 partiallji- separating, evidently being forced apart "by 

 pressure of the pistil and stamens from heneath, TlPhile these 

 flowers were "being examined, one flower was seen to "become 

 self triiiped. The pistil and stamens snapped up vigorously 

 against the standard, scattering the pollen around, no 

 ohject had come into contact with any portion of the flower. 



The calices of all tripped flowers were marked with 

 carhon ink as soon as they were found to he tripped. The 

 numher of flowers that were tripped, and the pods that 

 developed from tripped and untripped flowers, are shown in 

 Tahle Xlll. 



(30) 



