T. H. MORGAN AND C. B. BRIDGES 



641 



TABLE I. 

 Grades of the Trident-Pattern "With" in Various Stocks and Experiments. 



Per 



cent 



Grade J 

 Centers 



n 



m 



IE 



ir M 



M 



H 



z 



Fig. 2. Curves representing the distribution of grades of the trident-pattern 

 "with" in various stocks and experiments. Curve a = "Fahnouth" wild stock, 

 h = "with" stock, c = Fi from "Fahnouth" x "with," J = F2 from "Fal- 

 mouth" X "with," e = expected F2 as calculated from the observed distribu- 

 tions in the parental stocks and Fi. The curves were drawn free-hand to con- 

 form to the plotted points. 



