Some Laws of Heredity 33 



insect visitor. When later these buds open 

 in the usual way, showing thereby that their 

 pistils are ripe and ready for pollination, a 

 small brush is touched to the pollen-bearing 

 anthers of a normal flower on a vine that wiU 

 bear yellow peas, and then this poUen is dusted 

 on to the stigmas of the bagged blossoms on 

 the vines that would naturally bear green peas. 

 In a similar way the bagged blossoms on the 

 vines that would normally bear yeUow peas 

 are pollinated with the pollen from those bear- 

 ing green peas. The bag is removed from the 

 flower only long enough to apply the poUen 

 with the little brush, and then it is left in 

 place so that no . other pollen can get on to 

 confuse the results. 



When the peas formed in the pods that grew 

 from these cross-poUinated parent blossoms 

 in Mendel's experiment, they were aU of the 

 yellow sort. These were then planted and 

 the blossoms on the resulting vines (the chil- 

 dren) were allowed to pollinate freely, just 

 as they do ordinarily in the garden. The peas 

 that now formed (grandchildren) on these plants 



