50 



ROBERT W. HEGNER 



19.97 units for the binucleate class are probably low, since speci- 

 mens are included in the table that had no doubt not yet reached 

 the full size characteristic of 1 or 2 nuclei. When the means for 

 the various classes given in tables 15, 17, and 20 are combined 

 and averages obtained, the following data result : 



/. Differences between differeyit families with regard to nuclear 

 number and diameter 



1 . Variations in nuclear nimiber and diarneter iri wild specimens 

 and witJmi small families. As noted on page 36, considerable 

 variation between diameter and nuclear number was found among 

 wild specimens. Some of these are as follows : 



Also among the twenty-five small families there were some with 

 a large number of nuclei that were smaller in diameter than 

 others with fewer nuclei. For example, in family 12 twenty- 

 three specimens with 6 nuclei averaged 30.43 units in diameter 



