272 Prof. K Pearson. On a Criterion which may [Mar. 4, 



approach to a hyperbolic distribution of the array variabilities. The 

 hyperbola would have its axis vertical and vertex downwards. In the 

 case of stature I give the hyperbola that would result from a special 



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Diagram I. — Arrays of 



case, namely, Dr. Boas's hypothesis of equal numbers of offspring 

 with equal variability and of like mean following each parent. The 

 equation to this hyperbola may be found from (xi), by putting 



