408 Miss F. E. Cave-Browne-Cave. Influence of the [Dec. 20, 



DlAGBAM I. 





I 



?3 





<p p 



jo ai-eog 



jo SI-BOS 



clearly be mi-m 2 and m 1 '-m 2 / respectively. Hence, if N be the 

 number of pairs correlated, and if S denotes summation, we have 



