CHANGES IN EGG PRODUCTION. 



119 



1913-H 

 _ 1914-15 



1915-16 



1916-17 



.... I9I7-'16 



1918-19 



_ _ 1919-20 

 _ ^ 1920-21 



DAYS 



FiQ. 14. — Integral Curves showing the Percentage of Each Flock beginning to lay at or 



before the Ages indicated. 



One exceptionally old bird is omitted from 1915-16, and one from 1920-21. 



25 



I9I3-M 

 l9/5-'l6 



(916-19 



^ 1920-21 



DAYS 



Fia. 15. — Frequency Polygons showing Percentages of Flocks begiiining to lay at Ages 



indicated. 



