scintilla juris

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
SCINTILLA JURIS, estates; A spark of right. A legal fiction, resorted to for 
the purpose of enabling feoffees to uses to support contingent uses when 
they come into existence, thereby to enable the statutes of uses, 27 Henry 
VIII., to execute them. 4 Kent's Com. 238, et seq., and the authorities 
there cited, for the learning upon this subject. 
    

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