LUTHER BURBANK 
It has been suggested that all trees that repre- 
sent a particular variety of cultivated fruit—say 
all Baldwin apple trees or all Seckel pears—are 
separated parts of the original tree of correspond- 
ing variety, and not descendants of that tree. 
Holding to this point of view, then, it is clear 
that the different “varieties” of apples might, from 
a biological standpoint, be classified as individuals 
rather than as races. 
Their inability to reproduce themselves in off- 
spring through the ordinary processes of genera- 
tion denies them the rank of races or varieties 
proper, let alone the rank of species. 
And after all the difference in appearance be- 
tween two apples that rank in the catalogs as 
specific varieties is not greater than we sometimes 
see manifested between brothers and sisters of a 
human family. A man more than six feet tall 
with florid complexion, light blue eyes, and flaxen 
hair, certainly represents a type quite different 
from that represented by a woman less than five 
feet tall with swarthy complexion and black eyes 
and hair. Yet we sometimes see such divergences 
as these between a son and daughter of the same 
parents. 
ORIGIN OF THE DIVERSIFIED TYPES 
We shall gain a somewhat truer conception of 
the meaning of our apple catalog, then, if we 
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