1912.] 



PUBLIC DOCUMENT — No. 31. 



89 



Table IV. — Correlation of Vine Length and Average Weight of Seeds 



borne, Alaska. 



1. No vino over 35 centimeters long produced seeds averaging 

 less than .22 grams each. 



2. Vines 35 centimeters or less produced many light seeds 

 and also many fairly heavy seeds, but none as heavy as the long 

 vines produced ; the average weight is far more variable. 



The same is true of the Alaska peas as shown in Table IV., 

 though less strikingly so owing to the smaller variability of 

 average seed weight in this variety. 



Table V. — Correlation of Vine Length and Average Weight of Seeds. 



Excelsior I., 40 centimeters or less, . . . , -j- .3038 ±z .0635 



Excelsior I., 41 centimeters or more, . . . . + .1669 z+z .0833 



Alaska, 60 centimeters or less, -f- .2779 =±: .0534 



Alaska, 61 centimeters or more, + .1662 ±z .0663 



In order to compute fairly the coefficient of correlation in 

 these two groups it is necessary to compute for the short and 

 long vines separately. The coefficients are given in Table V. 



