When an Order has been granted calling upon a Judge of the Court who has tried a prisoner to show cause why he should not state a case for the opinion of the Full Court, he ought to furnish materials in proper form for showing cause against the Order nisi: he ought not to state a case until the Order has been made absolute. But if a case stated prematurely contain the only materials upon which cause could be shown, the Court may amend the form, and allow such materials to be used in showing cause.