31'» 



THE AMEBIC AN NATURALIST 



[Vol. LII 



dashes is the curve of egg production for the winter of 

 1913-14, made by our Rhode Island Reds hatched in 

 March and April. This flock is the first flock about which 

 we have full data. They were the daughters of the orig- 

 inal flock, 1912-13, as described above, and for all essen- 



tial purposes were a random selection of individuals. 

 This flock, one generation removed from its standard-bred 

 ancestry, clearly differs from the 1907-08 flock of Pearl's 

 in containing many more fairly high birds. The data for 

 the 1913-14 flock, grouped in classes of 1-5 instead of 1-10, 



is shown by the continuous line in Fig. 15, where it is to be 

 compared with the winter record of 199 Barred Plymouth 

 Rocks made at the Maine Station for 1912-13. 6 The es- 

 sential similarity of the two curves is self-evident. As 



