FLOWERS OF LAGERSTROEMIA INDICA. 101 



three collections. Perhaps the differences in the standard 

 deviations show somewhat greater irregularities than do the 

 means. Turning to the coefficients of variation for the three 

 characters, we note that while there is considerable fluctua- 

 tion from series to series, and from year to year, for the 

 sepals and petals, the constants are of the same general 

 order of magnitude. For both sepals and petals they are 

 conspicuously lower in 1904. For the large stamens, the 

 values for 1903 and 1907 are in close agreement, but differ 

 widely from that for 1904. 



For comparison with these constants we note that Pearson 

 and his associates* found the coefficient of variation for 

 Ficaria ranunculoides to range from 3.24 to 22.02 for the 

 sepals, from 5.34 to 14.60 for the petals, and from 12.12 to 18.77 

 for the stamens, in various habitats. Calculating the coeffi- 

 cients of variation from Yule'sf means and standard devia- 

 tions for sepals of Anemone nemorosa from a series of habi- 

 tats, I find that they range from 9.8 to 13.4. I have also 

 calculated the coefficients of variation for the lateral flowers 

 of Adoxa from the data given by Whitehead^ and find that 

 the values range from 7.35 to 10.41. 



TABLE B. CORRELATION IN LAGERSTROEMIA. 



Relationship and Series. 



Correlation and 

 Probable Error. 



Sepals and Petals in 1903 



1.000 ±.000 



Sepals and Petals in 1904 



.724±.012 



Sepals and Petals in 1907 



.879 ±.006 



Sepals and Stamens in 1903 



.082 ±.067 



Sepals and Stamens in 1904 



.438 ±.020 



Sepals and Stamens in 1907 



—.046 ±.025 



Petals and Stamens in 1903 



.082 ±.067 



Petals and Stamens in 1904 



.591 ±.016 





—.032 ±.025 







The coefficients of correlation and their probable errors 

 appear in Table B. • 



* Pearson, K. and others. Biometrika. 2 : 148. 1902. 



t Yule, G. U. Biometrika. 1:307-309. 1901. 



i Whitehead, H. Biometrika. 2:108-113.1902. 



