per 15-minute period. The increased feeding response under the 

 additional stimulation of extract is apparent without further statis- 

 tical analysis. The data are not suitable for isolating and testing 

 the component of variance associated with daily variation in 

 response; 



Table G - Mean number of passes at lures 



under two experimental conditions 



RESPONSE TO LURES OF DIFFERENT COLORS 



Each lure of a pair differed from its mate in color. 

 The following combinations were tried: white-red; white-black; 

 white- silver; red=black; and silver = black„ As already explained, the 

 positions of the lures were interchanged between experiments o The 

 number of passes at each lure per 15-minute period was determined 

 when lures were used alone and when they were used in combination 

 with extracto The results are summarized in table 9. 



From the table it will be observed that the white lures 

 received either the same or, more usually, a greater number of 

 passes than the colored lures (either tested alone or with extract) 

 when paired with red, black, or silver lures. Similarly, the red 

 lure seemed superior to the black in nunnber of passes. Howeverj 

 none of the ratios p either individually or grouped according to simi- 

 lar experiments r differ significantly from a 1:1 ratio when tested 

 with Chi'Square- From the pooled data for white versus all other 

 colored lures with which it was paired there is evidence of the superi- 

 ority of white. The ratio of pooled values for white vs, color is 

 155;122 which, when compared with the hypothetical 138,5tl38„5„ 



74 



