ON THE CHERRY 
appearance, and there will be nothing in the ap- 
pearance of their fruit, to indicate which of them 
contain only the factors of dominance (BB), and 
which contain the recessive factor combined with 
the other (Bb). Yet for the purpose of future ex- 
perimentation, in which we shall be obliged to call 
on succeeding generations, it makes a vast differ- 
ence which individuals are selected. 
We are well aware of this as we walk along 
the row of our seedlings, but we are also aware 
that there is no method by which we can fathom 
the secrets of the germ plasm of our seedlings, to 
determine which are BB and which are Bb stock— 
save only the method of future breeding. 
In spite of our best endeavors it may very well 
happen that the ten or twelve seedlings that we 
now select, to be grafted for the continuance of 
our experiment, include not a single pure domi- 
nant (BB), but are made up exclusively of mixed 
dominants (Bb). We have seen that the latter are 
twice as numerous as the others, and that the two 
look just alike; therefore the chances are two to 
one that they will be chosen in the majority, and 
it will not be strange if they are inadvertently 
chosen to the exclusion of the others. 
Yet this choice will insure that the factor of 
smallness which we are striving to eliminate was 
carefully preserved in the germ plasm of the 
[83] 
