DAVENPORT AND BULL.\RD. — COHRKLATED VARIATION. 



95 



consequently, 



li = 



n 



T "•" T, "^ ^. "^ ' • • ^". 





n 



A 1 ^ rfr 



since J, and J,, are constant. It results from this that it is only 

 necessary to find the mean of the ratios of the untrausmuted deviations 



and multi[ily this by the quotient - . This saves a great many divisions, 



and it has been the method pursued in our work. 



After this statement of the method of expressing correlation we now 

 pass to a consideration of the results obtained with the glands of the pig. 

 We shall consider first the correlation between the number of glands on 

 the right leg of the male with that on the left leg of the male. 



TABLE III. 



d R CORRELATED WITH c? L. 



