0.0073 and 0.0083 respectively. Comparisons of the variances of the different sections showed 
that these also were not alike. The variance of 0.0048 for section 3 was significantly smaller 
than the variances of 0.0066 and 0.0070 for sections 1 and 2 respectively. 
Table 3, --Analysis of variance of diameters of mature eggs from different 
parts of the ovary 
Degrees of Sum of Mean 
Source squares Sauene 
Between sections 2727. 861 1363.931 
Positions of the same section 2910. 770 485,128* 
Samples of the same position 666, 086 83.261 
Individuals of the same sample 150010. 449 60. 733 
Table 4,--Analysis of variance of numbers of mature eggs from different 
parts of the ovary 
Degrees of Sum of Mean 
Source 
freedom Squares square 
Between sections 2 8527. 084 4263, 542 
Positions of the same section 6 7842, 203 1307. 034 
Samples of the same position 8 30176. 967 S722 
6 
The diameter means of the positions and the sections were therefore recompared by a 
test that adjusted for the heterogeneity of variances (Cochran and Cox 1950), Not only was a 
difference found in the means between positions but between sections as well, The mean of posi- 
tion C, when compared with those of A and B, produced "t"' values of 4,004 and 4,641, which are 
beyond the 0.001 probability level. Significant "t" values of 6.616 and 6.389 resulted when the 
mean of section 2 (0.9433) was tested against those of sections 1 and 3 (0.9626 and 0. 9672 
respectively), These results indicate shortcomings in the sampling technique used, but since 
the precaution had been taken to obtain all samples from the middle section (see page 7), the 
diameter measurements from the different ovaries are comparable, 
Distribution of eggs in right and left ovaries 
Another preliminary step in the investgiation was to examine possible differences between 
the size distributions of the eggs in the right and left members of a pair of ovaries. Samples were 
taken from both ovaries of a pair (no. 21) according to the sampling procedure described below, 
Measurements were made of all eggs with diameters greater than 0.143 mm. and recorded in 
table 5. This lower limit was arbitrarily picked to avoid measuring the tremendous number of 
smaller eggs. The frequency distributions for the right and left ovaries were compared by a chi- 
square test (Snedecor 1946, pp. 205-207). The result, a chi-square of 24.411 (P = 0.6, 27 
d.f.—'), leads to the conclusion that differences between the frequency distributions of egg 
diameters for the right and left ovaries of the same pair are negligible, 
2/ 
— The last three classes were combined because of their low frequencies, 
