98 
FOUL TR Y SCIENCE 
little attention), it also furnishes an extensive supplementary 
series of such correlations for the first year which are available 
for comparison with those already deduced for the White Leg¬ 
horns (Harris and others, !oc. cit .) and for the Rhode Island 
Reds (Harris and Goodale, 1922). 
II. Materials 
The data for 443 Single Comb White Leghorn birds upon 
which the constants here discussed are based are derived from the 
records of the First International Egg Laying and Breeding Con¬ 
test at Vineland, New Jersey. Details concerning this contest 
have been sufficiently described by one of us (Lewis and others, 
1916-1920). Further statistical data are given in two earlier 
publications on the White Leghorn breed (Harris and Lewis, 
1921, 1922). 
TABLE I 
Comparison of correlation between monthly egg production and annual 
egg production, and monthly egg production and the record of the remain¬ 
ing eleven months of the first year. 
Month 
Correlation 
with total 
production 
r/E r 
Correlation with 
other eleven 
months 
production 
r/K r 
Difference 
Per¬ 
centage 
reduc¬ 
tion 
November 
.5360 H-.022S 
23-51 
.3840 ±.0273 
14.07 
—• 1520 
28.4 
December 
.6509 A.01S5 
35 -18 
-5>55 ±-0235 
21.94 
—. 1.354 
20.8 
January 
.6309 ±.0193 
32.69 
.4996 ±.0241 
20.73 
—.1313 
20.8 
February 
.5138 ±.0236 
21.77 
.3941 ±.0271 
14-54 
—.1197 
23-3 
March 
.491S ±.0243 
20.24 
.4125 I.0266 
> 5-51 
—•0793 
16.1 
April 
.4680 ±.0250 
18.72 
.3987 ±.0270 
14-77 
—.0693 
14.8 
May 
.4790 ±.0247 
19-39 
.3961 ±.0270 
14.67 
— .082Q 
17-3 
June 
.43S6 ±.0259 
16.93 
.3340 ±.0285 
11.72 
—. 1046 
23.S 
July 
.5005 L.0240 
20.85 
.3761 A. 0275 
13.68 
—.1244 
24.9 
August 
.6051 ±.0203 
29.81 
.4720 ±.0249 
18.96 
—- 133 ' 
22.0 
September 
.6424 ±.0188 
34-17 
(N 
O 
41 
<N 
10 
21.49 
— -' 33 2 
20.7 
October 
■ 5407 ±.0227 
23.82 
.4048 0268 
15.10 
—.1359 
25 -i 
