76 Maine: agricui,turai, i;xpe;rime;nt station. 1909. 



The egg records of such of these 350 "unregistered" pullets 

 as survived the period included in the experiment are shown in 

 Table VII in the form of frequency distributions. The manner 

 in which this table is to be read will be plain from an illustration. 

 From the first column of the table it appears that of the birds 

 kept in 50 bird pens there were 6 whose egg production between 

 November i and March i fell between 3 and 5 eggs inclusive. 

 Again there were 3 birds in the 100 bird pen whose egg produc- 

 tion between March i and June i fell between 24 and 26 eggs 

 inclusive. 



The means and constants of variation deduced from these 

 frequency distributions are given in Table VIII. The data for 

 comparison of "registered" and "unregistered" pullets in respect 

 to their average egg production and in respect to variation in 

 egg production are also given in this table. The differences 

 between "registered" and "unregistered" pullets in respect to 

 egg production are designated as plus when the constant for the 

 "unregistered" birds is the larger and minus when the constant 

 for the "registered" birds is the larger. 



From this table the following points are to be noted : — 



I. The mean egg production of the "registered" pullets 

 (daughters of "200-egg" hens) is, with a single exception, 

 smaller than the egg production of the "unregistered" birds (not 

 daughters of "200-egg" hens), regardless of the season of the 

 year or of the size of the ])ens in which the "unregistered" birds 

 were kept. The single exception to this rule is found in the 

 comparison with reference to spring production between the 

 "unregistered" birds kept in a flock of 100 and the "registered" 

 birds. The difference, however, in this case is small and only 

 arises because of the fact that the "unregistered" birds in the 100 

 bird pen made an exceptionally bad record during the spring 

 months as compared with the other "unregistered" birds. The 

 differences between "registered" and "unregistered" became 

 smaller as the size of the flock in which the "unregistered" birds 

 were kept was increased. During the periods under discussion 

 the birds did not do so well in the large flocks as in the smaller 

 ones. 



The lower egg production of the "registered" as compared 

 with the "unregistered" birds (data from 50 bird flocks) is 

 shown graphically in Figs. 12 and 13. These figures give plot- 



