PLATE XIII. MAINTENANCE AND PROPAGATION OF PURE STRAINS. 



Bee-proof cages of brass gauze mounted in sectional panels of iron, each cage being one- 

 thirtieth of an acre in area, costing about 70, and producing about twenty pounds weight of 

 uncontaminated seed each year for the purpose of sowing propagation plots. This method is 

 actually cheaper than bagging flowers by hand for the same purpose. View of, and through, 

 the corner of two cages. 



