9. Under the new Constitution the jurisdiction of the Privy Council as the ultimate appellate authority will disappear and it is obviously desirable that a similar jurisdiction should now be conferred on the Supreme Court. So far as the British Indian units are concerned, this jurisdiction should be co-extensive with the present jurisdiction of the Privy Council. As regards the Indian State units, there are at least two classes of cases where, in the interests of uniformity, it is clearly desirable that the final decision should rest with the Supreme Court, namely—
(1) cases involving the interpretation of a law of the Union, and
(2) cases involving the interpretation of a law of a unit other than the State concerned.
Sir B. L. Mitter suggests that such uniformity can be obtained either by invoking the appellate authority of the Supreme Court or by a reference of the particular issue to the Supreme Court Cases involving the constitutional validity of a law of the Union or of any unit have already been dealt with; they will all necessarily fall within the Supreme Court’s jurisdiction.