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 WINTER ECG P^^DUCT!OH 



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Fig. 8i. Diagram showing range of variation and mean fecundity in 

 each generation of line D5D39. The main polygons of variation give 

 the distribution of fecundity in the general flock in each generation. 

 The cross-hatched areas represent the pedigree line, and the heavy dotted 

 lines through these areas represent the mean fecundity of the line in each 

 generation. [It should be understood that in this and the following line 

 diagrams the cross-hatched areas are not frequency polygons. They 

 merely give (a) the upper and lower ends of the range of variation in 

 the line in each generation, (b) the mean of the line, and (c) the por- 

 tion of the range which was bred from in each generation to produce 

 the next generation. Note added in reprinting.] 



