SEC. 18. And be it further enacted, That when in a circuit court, judgment upon a verdict in a civil action shall be entered, execution may on motion of either party, at the discretion of the court, and on such conditions for the security of the adverse party as they may judge proper, be stayed forty-two days from the time of entering judgment, to give time to file in the clerks office of said court, a petition for a new trial. And if such petition be there filed within said term of forty-two days, with a certificate thereon from either of the judges of such court, that he allows the same to be filed, which certificate he may make or refuse at his discretion, execution shall of course be further stayed to the next session of said court. And if a new trial be granted, the former judgment shall be thereby rendered void.