LUTHER BURBANK 



of this variety throughout a term of years may be 

 higher than that of others that in any given season 

 may surpass it. 



There is obvious opportunity to hybridize this 

 variety with the other varieties of the Persian wal- 

 nut that blossom earlier, but produce a better crop 

 of nuts. Such crossing would doubtless supply 

 material from which races may be developed that 

 will retain the late blossoming habit of the Fran- 

 quette, combined with the nut producing qualities 

 of the other parent. 



We have seen that a tendency to fruit late in 

 the season is usually correlative to a tendency to 

 early ripening of fruit so that late bloomers are 

 adapted to growth relatively far to the north. A 

 late blooming strain of the Franquette walnut 

 might furnish material for the development of a 

 variety of walnuts that will be hardy enough to 

 grow in higher altitudes than those to which the 

 English walnut is now limited. But for the pro- 

 duction of real hardy races it is probable that 

 hybridizing with the black walnut the same cross 

 that produced the Paradox must be looked to, to 

 supply the foundation for a series of experiments 

 in selective breeding. 



The pioneer work, indeed, has been done in 

 the production of the Paradox walnut itself. 



It may reasonably be supposed that further 



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