28 THE PLANT WORLD. 



which the bag is removed for the purpose of castration and 

 pollination. The audacity of some of the short-tongued bees 

 has necessitated the sacrifice of a number of flowers after 

 the greatest care had been used in controlling their pollina- 

 tion. Experience has taught in all those cases in which the 

 entrance of foreign pollen would make itself plainly apparent 

 in the result, that the precautions taken gives essentially per- 

 fect control of pollination. 



( To be continued. ) 



