Vol.. 7, 1921 GENETICS: J. A. HARRIS ET AL. 
217 
0 2 4 6 8/0 12 14 IG 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 SO 
DIAGRAM 1 
record. The shaded areas are determined as follows. The birds were 
first grouped into classes of five eggs range with respect to number of eggs 
laid during the period of time used as a basis of prediction. The birds of 
these classes of five eggs range were further subdivided into those in which 
actual egg production was greater than the predicted and those in which 
the actual number was less than the predicted number. 4 The average 
