2 
The inheritance of certain Quantitative Characters in Tobacco. 127 
Of the five F, generations of cross (402 >< 405) which were grown, 
one was somewhat more variable than the parents, two gave a 
variation about intermediate between F, and F,, and two were as 
as variable the F, generation itself. 
Fig. 7. (402 x 405)—1—2. A representative plant of an F 3 generation of a cross 
between Havana and Cuban. This selection bred true for the Cuban leaf shape. 
The most interesting feature of the cross is the fact that of the 
F, generations, those two which gave an intermediate variability 
had a much larger mean than that of either parent. According to 
our hypothesis, 16 AABBCCDD should give a type breeding true for 
24 leaves. These assumptions illustrate the idea although in the 
actual cross the conditions are more complex, due undoubtedly to 
the interaction of a greater number of factors. 
