extent the stigma is sterile to the pollew of its own 

 flower, of the same cluster and of other flower clusters 

 of the same plant. 



Medicago I'lowers Tripping Historical Resume' 



(Bulletin No. 151, Kansas Experiment Station H. P. 

 Roberts and G. P. Preeman, Dec. 1907.) 



Roberts and Freemam give the results of some experi- 

 ments to determine the effect of close pollination. Plants 

 were inclosed in wire netting tents. A portion of the 

 flowers were pollinated hy hand and a portion were left 

 without pollination. On the plant on which this experi- 

 ment was carried out 59 seeds were produced from flowers 

 which were not hand pollinated and 118 seeds were pro- 

 duced from the hand pollinated flowers. In another ex- 

 periment with five different plants which were producing 

 seed abundantly, wire netting, cages were placed across, 

 the middle of the plant thereby enclosing the half on 

 which the flowers were to be hand pollinated within the 

 cage and leaving the remaining; half standing out side the 

 cage freely accessible to insect visitors. 



Par more pods and even more pods containing; seeds 

 were produced on the hand pollinated series but a greater 

 number of seeds per pod were produced in the insect 

 pollinated series and as a matter of fact more seeds per 

 plant on this account. Taking the green weight of the 



(70) 



