No. 639] GROWTH AND NUCLEAR DIVISION 345 



were magnified 650 diameters. These data are shown in 

 Table II. They indicate one point of considerable inter- 

 est and that is the fact that as the number of nuclei in- 

 creases their average volume and surface decrease. 



Thus in specimens with 4 nuclei of equal size each nucleus 

 has an average volume of 53.87 cu. mm., in specimens 

 with 6 nuclei the average volume per nucleus decreases 

 to 44.14 cu. mm., and in specimens with 8 nuclei the aver- 

 age volume per nucleus decreases still further to 42.07 

 cu. mm. Similar results were obtained from measure- 

 ments of the surface of the nuclei, but the decrease is not 

 so great since the volume decreases as the cube whereas 

 the surface decreases only as the square. As the table 

 (II) shows the average surface per nucleus in sq. mm. 

 decreased from 65.33 sq. mm. in specimens with 4 nuclei, 

 to 58.81 sq. mm. in specimens with 6 nuclei, and 57.37 

 sq. mm. in specimens with 8 nuclei. This decrease in vol- 

 ume and surface may account for the fact noted ])re- 

 viously (in (5)), that the area per nuclnis (h-civns.'s in 

 specimens with nuclei all equal in size as t!ic mimlM r of 



