c. V. L. CHäRLIER, trientalis europjea. 



11 



The vallies of the thickness was also evaluated with the 

 help of the ocular-mikrometer. 



9. Leaves in the rosule. These were examined regarding 

 a) the length of the longest leaf in the rosule, b) regarding 

 the length of each leaf in the rosule, examining separa- 

 tely samples with 5 and with 6 leaves, c) regarding the 

 length and the breadth of the leaves, and d) regarding the 

 correlation between the length and the breadth of the longest 

 leaf. The last-named investigation shall be given beneath 

 together with other questions on the correlation between 

 different characters. 



a) The length of the longest leaf was found to be in- 

 timately connected with the number of leaves in the rosule. 

 The more numerous the leaves in the rosule are the longer 

 is the longest leaf. I give therefore here seperately the re- 

 sult for samples with 5, 6, 7, 8 and 9 leaves in the rosule. 



Length of the longest leaf. 

 IV = 5 mm. 



Calculating the means and the dispersions we obtain 



