﻿668 Harris: Distribution and correlation of sexes 

 the correlation ratio* and using Blakeman'sf well-known 



Correlation r 



The values of Blakeman's criterion all suggest significant non- 

 linearity. The one which may be given the greatest weight is that 

 for the regression of pistillate or staminate flowers in A . prohosci- 

 deum. An examination of the diagram, Fig. 2, shows a peculiar and 

 (on the basis of the data in hand) quite inexplicable periodicity 

 in the distribution of the mean number of pistillate flowers. While 

 the graphs themselves and the critical statistical constants in- 

 dicate that straight lines do not exactly describe the interrelation- 

 ship between the two variables, it is impossible to assert from the 

 data as they stand that any curve of a higher order would express 

 the rate of change in the mean value of an associated character 



