Actus incaeptus cujus perfectio pendet

Actus incaeptus cujus perfectio pendet, ex voluntate partium, revocaripotest; si autem pendet ex voluntate tertia personae, vel ex contingenti,revocari non potest. An act already begun, the completion of whichdepends upon the will of the parties, may be recalled; but if it dependon the consent of a third person, or of a contingency, it cannot berecalled. Bacon's Max. Reg. 20.