616 THE AMEBIC AN NATURALIST [Vol. XL V 



at (a) again as visible as in experiment 7 by pushing 

 aside the surrounding leaves. 



(a) Is inspected 15 times, including one entrance. 



(b) Is inspected 7 times, including- two entrances. 



(c) Is inspected 13 times with no entrances. 



The blossom at (a) has now become as attractive to 

 the bees as those at (b) and (c) which serve as controls. 



Experiment No. 9.— July 27. Period of observation 

 15 minutes, from 10 :50 a.m. until 12 :05 p.m. Triangular 

 arrangement as in preceding experiments with the fol- 

 lowing changes : 



(a) Petals of (a) in experiment 8 are removed and 

 artificial crepe paper petals of nearly the same color are 

 substituted. 



(b) Artificial blossoms growing in situ as a control. 



(c) Artificial floral structure used at (c) in experi- 

 ments 7 and 8. 



(a) Receives only two inspections. 



(b) Receives 16 inspections, including two entrances. 



(c) Receives 3 inspections, including one entrance. 

 The artificial nature of the paper petals at (a) was 



at once perceived by the bees in their passing flights. 

 The few inspections noted were indicated by a momen- 

 tary pause in flight quite unlike the more prolonged 

 hovering movements over the blossom at (c). 



Experiment No. 10.— July 27. Period of observations 

 20 minutes, from 12:05 p.m. to 12:25 p.m. The same tri- 

 angular arrangement was used as before. The only 

 change from experiments 8 or 9 consisted in placing three 

 real cotton petals carelessly upon the paper petals at (a) 

 in such a way that only part of the paper petals was con- 

 cealed. Blossoms (b) and (c) were left unchanged. 



(a) Receives 11 inspections. 



(6) Receives 7 inspections, including one entrance. 

 (c) Receives 21 inspections. 



Passing bees were at once led to inspect the real petals 

 placed at («), although these very imperfectly covered 

 the artificial paper petals beneath. No very decided re- 



