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17. — Curve showing amount of sealed 
brood found weekly during the season of 1922 
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. — Curves showing total eggs, unsealed larvae, and scaled brood found weekly 
during the season of 1920 in colonics A and B 
