106 
PO UL TR Y SCIENCE 
with their probable errors. Thus these results are in general 
agreement with those for annual production given in table 3 and 
discussed above. 
Before an interpretation of these results is undertaken it will 
be desirable to determine whether this is a general law or whether 
it may possibly be due to some peculiarity of the flocks or of the 
meteorological or other conditions of the two years under consid¬ 
eration here. This task must await the assembling of further 
biological data. 
IV. Summary and Conclusions 
The primary purpose of the present paper is the presentation 
of the results of a biometric investigation of the relationships be¬ 
tween the egg records of various periods in the second laying 
year of the White Leghorn fowl. For purposes of comparison 
the homologous correlations for the first year are also determined. 
The results show that the correlations between the productions 
of the individual months and the annual total in the second year 
are, roughly speaking, comparable in magnitude with those 
which have been demonstrated for the first year production in 
previous investigations on the White Leghorn, the Rhode Island 
Red and the White Wyandotte breeds. This is also true of the 
correlation between monthly egg record and the egg record of 
the other eleven months of the year. 
The regression of total annual production on monthly produc¬ 
tion in the second year is, roughly speaking, linear. Thus the 
prediction of annual production from monthly records should be 
possible with the same order of accuracy as in the first year. 
V. Literature Cited 
Harris, J. Arthur, Blakeslee, A. F. and Kirkpatrick, W. F., 1917. Inter- 
periodic correlation in the egg production of the domestic fowl, l’roc. 
Nation. Acad. Sci. 3 : 565-569- 
Harris, J. Arthur, Blakeslee, A. F., and Kirkpatrick, W. F., 1918. The 
correlation between egg production during various periods of the year 
in the domestic fowl. Genetics 3 : 27-72. 
Harris, J. Arthur, Blakeslee, A. F. and Warner, D. E., 1917- Body pig¬ 
mentation and egg production in the fowl. Proc. Nation. Acad. Sci. 
3 : 237-241. 
Harris, J. Arthur, Blakeslee, A. F., Warner, D. E. and Kirkpatrick, W. F., 
1917. The correlation between body pigmentation and egg production 
in the domestic fowl. Genetics 2 : 36-77. 
