LUTHER BURBANK 
same kind of cross as the Willits, is a large, juicy, 
almost seedless fruit, only slightly more bitter than 
the sweet orange. 
“Young trees of these three varieties have en- 
dured a temperature of eight degrees above zero, 
and it is thought that by the use of these, and of 
similarly obtained varieties, citrus fruit culture 
can be extended fully 400 miles north of the 
present region.” 
Doubtless the orange will always remain a rela- 
tively tender fruit, for it is an evergreen that has 
never wandered far from the Tropics. But it is 
equally little to be doubted that it could be made 
much hardier than any existing race of citrus 
fruits, and the incentive for the production of such 
a hardy race is so great that there should be no 
dearth of experimenters in the field. 
The orange crop is occasionally blasted even in 
Florida by an unusual frost. In 1895, for example, 
the loss of the trees themselves was so great as to 
put a serious handicap on the industry for a term 
of years. So it is imperative that a race of oranges 
should be developed that will be capable of endur- 
ing occasional periods of cold. But, aside from 
the tentative experiments just noted, very little has 
hitherto been accomplished in this direction. 
The field is open for any experimenter who is 
located in a region that lies well within the present 
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