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THE AMEBIC AN NATURALIST [Vol. XL V 



At (a) a single petal was pinned to a stem. 

 At (b) control. A normal cotton blossom in situ as 

 grown. 



The single petal at (a) received 16 inspections, some 

 of which were very thorough, as a number of bees ap- 

 peared to examine the petal intently from all sides. The 

 control blossom at (b) received 26 inspections, including 

 8 entrances within. In both cases the visiting bees were 

 all species of Melissodes. 



Experiment No. 13.— July 27. Period of observations 

 one half hour, beginning at 2 :06 p.m. and ending at 2 :36 

 p.m. Two blossoms were arranged in the same row as in 

 the preceding experiment. 



At (a) a perfect cotton blossom was pinned in the 

 same relative position as the blossom at (&). 



At (b) control. A perfect cotton blossom growing in 

 situ. 



The blossom at (a) received 7 inspections, including 

 one entrance. The blossom at (b) received 12 inspections, 

 including 5 entrances. Species of Melissodes were the 

 only visitors. 



Experiment No. 14. — July 28. Time of observations 

 one half hour, from 9:15 to 9:45 a.m. Three blossoms 

 were arranged on three consecutive plants in the same 

 row. Throughout this series of experiments for July 

 28, these positions were unchanged. See the diagram. 



At (a) control. A perfect cotton blossom pinned in 

 position. 



At (b) large blossom of a wild convolvulus (white 

 with a deep purple throat) was pinned in position. 



