﻿666 Harris: Distribution and correlation of sexes 



of 5 units range. The correlation coefficient for the ungrouped 

 material may be computed from the condensed correlation 

 Table I. The correlation constants in Table IV are calculated 

 from the ungrouped observations. The first point to be noted is 

 that the less variable inflorescence of A. proboscideum shows a 

 distinctly lower correlation between the number of staminate and 

 pistillate flowers than does that of A . vulgare. The difference is 

 .226 ± .025, a value 9 times as large as its probable error and so 

 unquestionably significant. 



table III 



Pistillate Flowers 



m 





1 . 1 . 3 , . 



. 



^. 



.OU„ 



Staminate flowers: j 



13 5 38 



8? i 18 



\ 



E 



^60 

 781 

 566 



Totals 59 1,256 1 r, 163 20S 





3 



2,802 



If one expresses the results in terms of regression the linear 

 equations are 



For A . vulgare: 



P = -3796 + .1560 s, 

 s = 27.205 + 1.252^. 

 For A . proboscideum: 



p= 1.0299 + .09555, 

 5 = 15.836 + .490 p, 

 where s = number of staminate and p = number of pistillate 

 flowers. 



These values are deduced from the ungrouped observ^ations. 



