364 
FREDERICK J. PRITCHARD 
high negative correlation, confirming the general statements of 
Briem,v.Proskowitz (cited by Fruwirth (i)),and v. Riimker (2), and the 
statistical results of Harris and Gortner (3)^. The regression equations 
for each of the foregoing tables have been calculated by means of the 
formula 
(jp 
aW 
+ r 
crw 
and the relationships expressed in the following graphs (figs. 2 to 6) 
which also include the empirical means. 
^s/o/yr o/^ MOOTS' c?/?^Afs: 
Fig. 2, Relationship between percentage of sugar in the beet and weight of 
root. (To accompany table I.) 
/O.5 /2.5 /4S /65 /e.5 ^05 ePS 24.5 P6.5 PS S 30.5 32^^ 3-^.5 S6.3 J&.S '^.S ■^.S 
PP./S 
• 
• 
• 
\ 
t 
^ 
7 
• 
Fig. 3, Relationship between percentage of sugar in the beet and weight of 
root. (To accompany table I!, group a.) 
^ p equals percentage, w equals weight, r equals coefficient of correlation, the 
sigmas indicate the standard deviations of the two variables and the bars indicate 
means. 
