No. 587] VARIABILITY AND AMPHIMIXIS 665 



in scalariform conjugation, and thus their smaller varia- 

 bility. In considering the general constants of varia- 

 bility (Table V) based on the diameters it is to be noted 

 that the means (M.) do not differ, as was found when 

 considering length. The standard deviation (o-) and 

 the coefficient of variation (C. V.) once more demonstrate 

 the greater variability of the laterally formed zygospores. 

 The values of the constants for skewness (Sk.) are not 

 sufficient, however, when considered with the probable 

 error, to be of importance. The frequency polygons 

 (Fig. 6) illustrate conditions, although no curves have 

 been fitted. 



3. Comparative Correlation of Length and Diameter 

 In view of the results obtained in a consideration of the 

 variability, it will be of some interest to ascertain whether 



TABLE VI 





mi 



S S 8 g 



111:1 I'll 



ti t fi s = v. = 





38.0-39.9 



............ 





1 > 



40.0-41.9 

 42.0-43.9 







i 











50.0-51.9 

 52.0-53.9 









56.0-57!9 







1 § 











62.0-63.9 

 64.0-65.9 









68!o-69!9 









70.0-71.9 

 72.0-73.9 

 74.0-75.9 









76.0-77.9 

 78.0-79.9 









Totals 









