48 



BULLETIN 1349, U. S. DEPARTMENT OE AGRICULTURE 



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Fig. 17. — Curve showing amount of sealed 

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 in colony No. 4 











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Fig. 18. — Curves showing amount of sealed 

 brood found weekly during the seasons of 

 1921 and 1922 in colony No. 4. The curve 

 for 1921 is represented by a broken line; that 

 for 1922 by an unbroken line 



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 Figs. 19 and 20. 



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Curves showing total eggs, unsealed larvae, and sealed brood found weekly 

 during the season of 1920 in colonies A and B 



