CHANGES IN EGG PRODUCTION. 



119 



DAYS 



Fia. 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 



DAYS 



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

 indicated. 



