256 



for 



EARL W. BENJAMIN 



fleas? for ^ecor/tf 



Month 1st 2d 3d 4th 5th 6th 7th 8th 9th 10th llth 



FlG. 29. 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 



