074 



THE AMERICAN NATURALIST [Vol. XLV 



(a) Outer leaf covering removed from the blossom 

 used at (a) in preceding experiment, thus making the 

 outer surface of the petals visible. Honey at the base 

 within, as before. 



(b) Normal blossom pinned in position as a control. 

 No honey has been added to this blossom. 



(c) Normal blossom used in preceding experiment 

 with petals removed. 



Data foe Experiment No. 28 



1 





Di 











Di 









11 



! 







i 



I 





| 





f 



1 



I 



•s 



I 



i 



i 



t 



I 





jj 









J 





jl 





























By the removal of the outer covering of the blossoms 

 at (a), which in the previous experiment received no in- 

 spections, it became nearly or quite as attractive as the 

 control at (b). The blossom at (c), however, no longer 

 afforded means of attracting the bees. In this experi- 

 ment and the previous one the corolla at (a) was concealed 

 with portions of cotton leaves to guard against introducing 

 repellent odors which may have attended the use of any 

 other material. In the course of this experiment the 

 number of bees flying about became much reduced toward 

 ten o'clock, although the day was clear, hot and sunny. 

 The writer was even forced to postpone his observations 

 for the remainder of the forenoon owing to the scarcity 

 of visiting bees. 



Experiment No. 29. — August 1. Period of observation 

 one half hour, from 2:00 to 2:30 p.m. The material is 

 arranged in the same row. 



At (a) a cotton bud not due to open until the next 

 morning had its petals quite fully pulled open so as to 

 resemble a naturally opening blossom. 



