414 
LOOK : STUDIES IN PLANT BREEDING. 
also observed by Tschermak in the case of certain flower colours of 
Matthiola, and an explanation of this proportion is attempted on the 
same lines as 
This cross 
in the previous instance. 
seems also to afford an example of remarkable intensi¬ 
fication of both the allelomorphic characters of the same pair, namely, 
tallness and dwarfness—the former in F x , and both in F 2 and later 
generations. As regards shape of the seeds a complication is intro¬ 
duced by the appearance of the plant character, dimpled seeds, in the 
offspring of a cross between parents which showed the allelomorphic 
characters, smooth and wrinkled cotyledons respectively. 
A few other crosses support Mendel’s experiments and conclusions, 
which are indeed already sufficiently well established. 
Cambridge, July, 1905. 
