ON A NOVEL METHOD OF EEGAEDING ASSOCIATION 



17 



Illustration III. The following fourfold table is given by Macdonell (Biometrika, 

 Vol. I. p. 193) as connecting stature and head breadth in animals. 



Stature 





01 



Here log x'= 1-5718, 



i(l+a,) = -6487, i(l + a,) = -6410. 

 Hence, by Table V, ^^^ =1-2871, Xa2=l"2791, 



and .., = -^xx„.xx., = -0301. 



Either by interpolation from tables or the abac we reach "165 (actually '1654), 

 so that 7-= '17 is the nearest second place figure. Macdonellj assuming Gaussian 

 frequencies, finds 



r=-18±-02. 



Illustration IV. The following table is taken from my memoir on the relation 

 of intelligence to other mental characters (Biometrika, Vol. v. p. 146), It gives the 

 relationship of self-consciousness to intelligence in 2054 boys. The intelligent group 

 cover the quick intelligent and intelligent, the other group the slow intelligent to 

 very dull. 



Intellectual Grade 



o 

 o 



Here 



Hence, by Table V, 

 and 



log x' = 0-4942, 



f(H-aO = -5686, ^(1 -Ha,) = -5173. 



X„^ = 1-2601, Xa, = 1-2538, 



