266 Pearl and Surface. 
1. There was no definite increase in mean annual egg production 
during the period of eight years covered by the statistics. As is to 
be expected, there are up and down fluctuations in the several years, 
but the general trend of the means, as indicated by the fitted straight 
lines in Fig. 2, is certainly not upward. Taking the actual means 
the trend of the line is clearly downward. The line for the modified 
4-00 00-01 01-02 02-03 03-04 04-05 05-0b Ob-07 
Fig. 2. Diagram showing change in mean egg production during the progress of the 
selection experiment. The unbroken lines give the observed means, and the dotted 
lines the modified means. 
means is horizontal. There is no evidence whatever of any 
cumulative effect of the selection practised. 
2. The general trend of the variability as shown by the fitted 
line in Figure 3, is slightly to increase during the course of the 
experiment. No stress is to be laid on this slight increase. The 
important thing is that there is no evidence whatever of any 
decrease in relative variability as a result of the long 
continued and intensive selection. 
Chief Results of Selection Experiment II. 
The plan and purpose of this experiment have been stated above 
(p. 262) and need not be here repeated. We may first consider the 
the question as to what evidence the experiment furnished regarding 
the inheritance of fluctuating variations in egg production. The 
