Aug. 15,1924 Shape and Weight of Eggs in Relation to Sex of Chicles 201 
as shown in Table VI. The mean 
weight of the 30 eggs producing males is 
57.56±0.44 gm. and the mean weight 
of the 41 eggs giving rise to females is 
57.82 ±0.43 gm. The difference, with 
its probable error, is 0.26 ±0.61 and, 
therefore, is not significant. When the 
weights of the eggs that hatched and 
the weights of the eggs whose chicks 
died in shell at hatching time are taken 
into consideration, it is found that the 
mean weight of the eggs producing 
males is 58.49 ±0.17 gm. and the mean 
weight of the eggs producing females 
is 58.45 ±0.19 gm. as shown in Table 
VIII. The difference, with its probable 
error, is 0.04 ±0.25 and, therefore, is of 
no significance. 
From the Rhode Island Red females 
there were secured 226 eggs that 
hatched and on which the sex of the 
chicks was later recorded. The fre¬ 
quency distribution and mean weights 
of the eggs producing males and fe¬ 
males, respectively, are shown in Table 
VII. The mean weight of the eggs 
producing males is 58.06 ±0.26 gm. 
and the mean weight of the eggs pro¬ 
ducing females is 57.29 ±0.27 gm. 
The difference, with its probable error, 
as shown in Table VIII, is 0.77 ±0.37 
and, therefore, is not significant. The 
relative and absolute amounts of 
variability in both groups are quite 
small, as shown in Table VII. 
The mean weights of all eggs from 
the Barred Plymouth Rock and Rhode 
Island Red females producing males 
and females, respectively, are shown 
in Table VIII. The mean weight of all 
eggs producing males is 58.24±0.14 
gm. and the mean weight of all eggs 
producing females is 58.01 ±0.16 gm. 
The difference, with its probable error, 
is 0.23 ±0.21 and, therefore, is not 
significant. 
CONCLUSIONS 
As a result of this study, the following 
observations apply to eggs produced 
during the normal hatching: 
There is no correlation between the 
absolute length of egg and the sex of the 
chicks hatched from it. 
There is no correlation between the 
relative length or shape of egg and the 
sex of the chick hatched from it. 
There is no correlation between 
weight of egg and the sex of the chick 
hatched from it. 
