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In a competition betwixt an heir-male and an heir of line, an old tailzie being produced by the former, bearing, That the estate had always been conveyed to heirs-male, therefore the granter obliges himself to his father to provide the same, in like manner, to his heirs-male, &c. the Lords found this tailzie onerous, and so not revocable.
Fol. Dic. v. 2. P. 430. Fountainhall.*** This case is No. 386. p. 11212. voce Prescription.