In that situation, being satisfied that the appeal involved a substantial question of law as to the interpretation of the Constitution the determination of which was necessary for the disposal of the appeal, that Division Bench could refer the question for the opinion of a Constitution Bench and on receipt of the opinion dispose of the appeal in conformity with such opinion; but to accede to the argument of Sri Purshottam Trikumdas will lead us to hold that while a Division Bench of three 214 Judges could split up this very case, had it been posted before it in the first instance, by referring the con stitutional questions to a Constitution Bench for its opinion and then, after receipt of that opinion, disposing of the rest of the case on merits in conformity with such opinion, a Constitution Bench of five or more Judges before which the case happened to be posted in the first instance could not split up the case by deciding the constitutional questions and leaving the rest of the case to be dealt with and disposed of by a Division Bench of less than five Judges on merits in conformity with the opinion of the Constitution Bench thus saving the time of the Constitution Bench.