SPECIES IDENTITY OF NUCLEUS-PLASMA NORM 



459 



These five cells in one micron serials carry with them the ap- 

 proximate correctness of the results from the more nonobjective 

 two micra serials. In the two micra serials the range of varia- 

 tion is practically within one unit, if the one exception (cell 4) 

 be excluded which disappeared when the technical cause was 

 eliminated (see section on "Technical variations"). The appli- 

 cation to the aggregate is thus broadened in a sufficiently con- 

 clusive way when compared with individual cell results making 

 up any of the series of twenty-five cells averaged in table 1. In 

 none of the eight series for which the statistical data will be given 

 later were there as many as ten cells so close to a constant mean. 

 A glance at the frequencj^-polygon will make this more clear 

 (text-fig. A). 



Third, after mathematical computation from the data of 

 serial sections, the figure for each of the one-micron cells is 

 very slightly larger than the corresponding figure from wax 



TABLE 3 

 Volumes and nucleus-plasma coefficients from prismoid formulas 



NUMBER OF 

 CELL 



(Table 2) 



VOLUME 



OF CELL 



IN CC. 



VOLUME 



OF NUCLEUS 

 IN CC. 



VOLUME 

 OF PLASMA 



NUCLEUS- 

 PLASMA CO- 

 EFFICIENT 



After one-micron serials 



