102 



COMPETITION AND CONSTANCY. 



tively small and produce little pollen, but are readily visible by virtue of 

 their deep blue color (plates 3, 7, 8, and 11). 



Table 69. — Rubus, Rosa, and Prunus. 



Experiments. — In order to save space some of the less important 

 details of installation are omitted and others are given in the discussion 

 that follows tables 70 and 71. As always, an equal number of flowers was 

 used as a rule or an endeavor was made to have the attractive surfaces equal. 



Summary. — Rosa acicularis proved to be less attractive than its com- 

 petitors taken collectively, the ratio being 327:420. Rubus strigosus 



