24 



ARKIV FÖR BOTANIK. BAND 12. N:0 14. 



It is to be remarked that the value of the dispersion of 

 the thickness of the stem deduced from this table did not 

 agree (taking into account the mean-errors) with the value 

 of this character found in § 7. In that § we obtained 



G = 0,189 ± 0,009, 



whereas the table above gives 



(J = 0,101± 0,008. 



I have been unable to explain the difference between 

 these values, which show that the 78 samples of this § are 

 — in respect to the thickness of the stem — , in some 

 manner, systematically taken out from the 236 samples con- 

 sidered in § 7. 



19. Correlation between the breadth and the length of the 

 longest leaf in the rosule. In respect to this pair of charac- 

 ters I have examined 152 samples, distributed into classes 

 as is shown from the following correlation-table. 



Breadth of the longest leaf 



As could be expected — which even can be directly seen 

 from the correlation-table — there is a rather strong corre- 

 lation between these characters. We get indeed 



r = -h 0,892 ± 0,037. 



