c V. L. CHARLIER, TRIENTALIS EUROP^IIA. 



23 



Length of the flower-stalk 



w\ 



6 mm. 



From this table we get 



r = -r 0,321 ± 0,080, 



SO that even here a positive correlation is manifested, though 

 not so well defined as that between the thickness of the 

 stem and the length of the longest leaf. 



18. Correlation between the length of the flower-stalk and 

 the thickness of the stem. There were 78 samples examined 

 as given below. 



Length of the flower-stalk 

 w^ = 6 mm. 



The resulting value of the coefficient of correlation was 



r = + 0,484 ± 0,099, 



hence even here a pronounced positive correlation. 



