yields an adjusted Chi-square o£ 3,7 with one degree of freedom 

 (P = 0<,06), which could be regarded as evidence for rejecting the 

 hypothetical equality ratio. Although there is this evidence of a 

 significantly greater number of passes at the white as compared with 

 the colored lureS;, the superiority of the white lure is slight. Knowing 

 that the tunny will make a pass at any inanimate object which appears 

 on the surface,, including not only lures but also leaves^ stickSj pieces 

 of paper, etCo ;, the slight superiority of the white lure may perhaps be 

 attributed to its greater visibilityo There is no assurance that this 

 superiority would be manifested in the sea;, where conditions of sea 

 water transparency and background color would be much different 

 from those in the pond. 



Table 9== -Number of passes at paired lures 



of different colors under two experi^ 

 mental conditions 



White -red 



White-black 



White -silver 

 Red-black 



Silver -black 



(1) 8.8 



fl) 



(2) 



3^3 



9=9 



(1) 1U8 



(1) 11 = 9 



(1) 23=20 



(2) 16-13 



(3) 9^6 



(1) 12-12 



75 



