No. 538] THE BEHAVIOR OF BEES 617 



pellent odors can be held to reside in the artificial paper 

 petals which failed to attract passing- bees when used 

 alone. 



Experiment No. 11. — July 27. Observations for this 

 experiment continued 10 minutes, from 1:26 to 1:36 p.m. 

 The triangular arrangement was used. 



At (a) a single real cotton-blossom petal is pinned to 

 a stem. 



At (b) a cotton bud and calyx simulated by neatly 

 wrapping a portion of a cotton leaf around the base of 

 five real petals rolled together. 



At (c) a normal open cotton blossom growing in situ 

 as a control. 



Data for Experiment No. 11 



1 



£ 

 1 









n by Species 





{ 



I 



j 



f 

 ! 



jlilji 



is r 



j }Tl Hifji 



* 8 j 1 1 1| 1 j S 



I 



2 







II ! Ill 



The single petal at (a) is sufficient to invite the in- 

 spection of passing bees, although there is little more 

 than a fraction remaining of the size and color of a 

 normal open cotton blossom. The writer has observed 

 that a partly opened bud, as represented at (c). appears 

 to invite more freqnent inspection and entrance than a 

 fully expanded blossom which has been much oftener 

 entered by bees. It is possible that bees in their en- 

 trances leave traces of odors which are detected by later 



one half hour, from 1:36 to 2:06 p.m. In this test, which 

 practically duplicates experiment 11, two blossoms were 



apart. 



