7*8 
Journal of Agricultural Research 
Vd. XXIII. No. 9 
Table I .—Relation of specific gravity to fertility 
Specific gravity. 
Number 
infertile. 
Number 
fertile. 
Total. 
1.01. 
2 
2 
I.02. 
1 
2 
2 
1.02. 
0 
2 
I.04. 
2 
0 
24 
78 
178 
264 
190 
56 
7 
0 
26 
1.02... 
12 
90 
213 
313 
230 
68 
2 
1.00 . 
35 
49 
40 
12 
1.07.. 
1.08. 
I.OQ. 
1.10. 
3 
10 
Total_ 
156 
802 
958 
-0.038i0.022. 
Since there is no apparent correlation between specific gravity and 
fertility, we have eliminated the infertile eggs in organizing data for the 
next subject of inquiry, which was the relation of specific gravity to 
hatchability of fertile eggs. Table II summarizes the results of this 
study. 
Table II .—Relation of specific gravity to hatchability of fertile eggs 
Specific gravity. 
Number 
fertile eggs 
not hatch¬ 
ing. 
Number 
fertile eggs 
hatched. 
Total. 
I. Ol. 
1.02. 
2 
2 
19 
6l 
112 
I42 
84 
24 
5 
2 
3 
24 
78 
178 
264 
190 
56 
7 
I.03. 
1 
5 
17 
66 
122 
106 
32 
2 
I.04. 
1.02. 
I.06. 
I.07. 
I.08. 
1.00. 
I.IO. 
Total..... 
45 i 
35 i 
802 
r— o.2Q4±o.o23. 
The observations summarized in Table II, made on 802 eggs, with a 
positive correlation of 0.204, indicates a slight relation between the two 
factors being studied, but the degree of correlation is so slight that it 
lacks practical usefulness for the poultry producer. 
The relation of the specific gravity of the eggs to the probability of the 
chick's living through the first five weeks, the critical period, was also 
studied with the chicks hatched in the second division of the experiment. 
