There is, as Mr. Handley for Parke Davis submitted, a short and conclusive answer to that contention. The Federal Court did no more than grant leave to file and serve a notice of appeal. It is always open to a court which has granted leave to appeal or special leave to appeal to rescind that grant if it later appears to the court, in the light of further information or argument, that the leave or special leave should not have been granted. That course has been taken by this Court in appropriate cases. The order of the Federal Court therefore did not finally dispose of the right of Parke Davis to appeal, or of the right of Sanofi to hold its judgment free of any possibility of appeal, because the Federal Court might, on reconsideration, rescind the grant of leave. It is irrelevant whether or not it is likely that the Federal Court would make an order rescinding the grant of leave, since it is the legal force of the judgment in question, and not its practical effect, that has to be considered in determining whether or not the judgment is a final one: see Hall v. Nominal Defendant [5] ; Carr v. Finance Corporation of Australia Ltd. [No. 1] [6] . For those reasons the order of the Federal Court was interlocutory and there was no right of appeal from it to this Court. The objection to competency was accordingly upheld.