c. V. L. CHARLIER, TRIENTALTS EUROP^A. 19 



Hence we obtain: 



P I. 



M = 0,0222 ± 0,0005 

 O = 0,0020 ± 0,0004 



(7:i¥ = 0,o9. 



p II. 



M = 0,040 ± 0,005 

 Ö = 0,006 ± 0,004 



o : M = 0,15. 



We find from the mean errors that the difference between 

 the means is too great to be explained trough mere accidental 

 variation, especially when taking into account the great 

 constancy of the pollen of the smaller dimension. 



14. Pistil. The length (p) of the pistil and the diameter 

 of the stigma (m) were measured for 19 and 8 samples re- 

 spectively. The individual values were: 



