530 
BIOLOGY AND HUMAN PROGRESS 
produced which grew a longer head with practically no beards 
(the middle head in Figure 437). Such a head of wheat would 
yield more kernels of wheat than either of the parent heads. 
Now if the scientific ex- 
Figure 437 . — Heredity in Wheat. 
The head of wheat on the left of this 
figure has beards. The pollen from the 
wheat flowers of this head was placed on 
the stigma of the wheat flowers that grew 
in the head shown in the right wheat head 
of this figure. When these kernels of 
wheat ripened, they were sown and pro¬ 
duced a wheat plant that had more wheat 
kernels than either parent. This is the 
head shown in the middle. (Photograph 
furnished by Cornell University.) 
pert can make this new 
wheat plant permanent, 
that is, produce seed 
which will always grow 
large heads, he has fur¬ 
nished the farmer with a 
new kind of wheat and 
has made a new dis¬ 
covery. 
What does the scien¬ 
tific man do who makes 
such a new discovery? 
He starts out to tell just 
as many people as he can 
that he has made a new 
discovery and asks them 
if they do not wish to 
try it. In order that as 
many people as possible 
shall have an opportunity 
to know about his new 
discovery, he writes a de¬ 
scription of it and sends 
it to some scientific jour¬ 
nal. He does not get 
any pay for his scientific 
article as do writers of 
stories, nor does he have his article copyrighted, but he 
invites any one who wishes to use his facts. 
Another example has to do with variation in resistance to 
disease. The American grape is a North American plant 
