EXPLANATION OF PLATES 

 Plate I 



Shows photographs of the first 12, the i8th, 30th, 42d and 54th eggs laid by hen No. 183. The 

 order of arrangement of the eggs on the plate is shown in the following scheme. 



Top 



1234 



Lejt 5678 Right 



9 10 II 12 



18 30 42 54 



Bottom 



