STUDY OF SELECTIONS FOR SIZE, SHAPE, AND COLOR OF HENS' EGGS 257 



It should be noted that the individuals whose data are used for the 

 later months of the year, shown in figures 28, 29, and 30, are those that 

 laid during the longest period and were very likely to be the highest pro- 

 ducers (Rice, 1914). This would indicate an agreement with Curtis 



34 

 Month 1st 



2d 



3d 



7th 



8th 



9th 



10th 



llth 



FlG. 30. MONTHLY VARIATION IN SIZE OF EGGS PRODUCED DURING A PERIOD OF SIX 



YEARS 



The figures in parenthesis designate the number of birds available for the respective calculations 



The curve representing the birds having a life mean of 45 or less does not lie entirely within that range 



because the whole six-years data on which the life mean is based is not available in monthly means for 



this chart 



(1914 a) and Hadley (1919) to the effect that the conditions causing the 

 production of a great many eggs will also cause the production of large 

 eggs. In order to see whether the results shown in figures 28, 29, and 30 

 were due to the selection of high-producing birds from the low producers, 

 as suggested above, figure 31 was constructed for five individuals which 



