Sex Ratios in Pigeons. 
489 
A. M. 7:30 8:30 9:30 10:30 11:30 12:30 1:30 2:30 3:30 4:30 5:30 6:30 7:30 P.M. 
Frequencies. 
A-egg. 1 1 8 34 34 23 
B-egg. 1 0 1 3 25 48 20 3 
Fig. 2. Curves showing time of day the two eggs were laid in 101 sets; solid line, first egg; 
dotted line, second egg, on second day following first. 
The distribution of frequencies with respect to the time of laying 
of both eggs is shown in Figure 2. The unbroken line represents 
the data for the first egg, the broken line for the second; but it must 
be remembered that although for convenience of comparison the two 
curves are here superimposed, in reality egg B is laid on the second 
day following egg A, and that therefore there is a period of nearly 48 
hours between the two curves. The frequencies for the respective 
classes are given below the figure. Basing our statements entirely on 
the data here presented, we may draw the following conclusions: 
1. Egg A is always laid in the afternoon, some time between the 
\ 
hours of one and seven. 
2. Egg A is most frequently laid from four to six in the afternoon; 
the mean time is 5:10 P. M. 
3. Egg B is usually laid early in the afternoon, most frequently 
between one and two o’clock, but may be laid as early as 8 to 9 A. M., 
and as late as 3 to 4 P. M. 
4. The mean time of laying of egg B is 1:22 P. M. 
