138 GENETICS IN RELATION TO AGRICULTURE 
race. In the actual experiment among seven families comprising a total 
of 440 plants only one produced white grains, but the F's generation 
demonstrated the adequacy of the three-factor analysis. The inter- 
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Fic. 62.—Resumé of ratios found in 142 families in the first five generations following 
the cross between Bursa bursa-pastoris and B. Heegeri. Each square represents a possible 
family, the position of a family being determined by the percentage of plants with tri- 
angular capsules as indicated at the base of the figure. (After Shull.) 
mediate shade of red produced in F; and the varying shades produced in 
segregation depend on the cumulative effect of the color factors. In- 
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