Botany and Zoology. 44] 
directions, with a freedom and facility not manifested by its wild ances- 
to is explains the readiness with which we continually obtain new 
. varieties of those esculent plants which bave been along time in cultivation, 
e a newly-introduced plant exhibits little flexibility. To detect the 
eatliest indications of sporting, and to select for the parents of the new 
tace those individuals which begin to vary in the requisite direction, is 
the part of the scientific cultivator. In this way, the elder Vilmorin suc- 
pers. : : 
Once originated, and established by selection and segregation for a few 
generations, the race becomes fixed and perpetuable in cultivation, with 
to initiate the deviation. The divellent force, or idiosyneracy, the source 
ensure that no two descendants of the same parent shall be just alike, 
being overborne by that opposite or centripetal force, whatever it be, of 
which ensures the particular resemblance of offspring to parents. Now 
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