250 LBSSOlfS WITS PLANTS 



care should be taken that no foreign pollen reaches 

 the stigma. 



Suggestions. — Each pupil should cross a few plants and save 

 the seeds and sow them, keeping records of the relative heights, 

 productiveness (number of flowers or fruits), color and other features 

 of the parents and offspring. He should not be discouraged if many 

 of the crossings fail, for the best operators often fail to "set" more 

 than half of the flowers. Fuller directions for this operation, and 

 also discussions of the philosophy of crossing, may be found in 

 Bailey's "Plant-Breeding." 



