The contention is noticed in our judgment in those appeals thus: " . the acquisition of the two undertak ings are challenged by the petitioner on several grounds, the principal attack, howev er, being that the legislations, brought forth, as they were, in the wake of the pri vate negotiations and the exercise of the option to purchase, are not bona fide, but constitute a mere colourable exercise of the legislative power and that, at all events the real objects of the two legislations have no direct and reasonable nexus to the objects envisage in clause (b) of Article 39 of the Constitution and that a careful and critical discernment of the context in which the legis lation was brought forth would lay bare before the judicial eye that what was sought to be acquired was not "undertakings" of the two companies but really the difference between the "market value" of the 490 undertakings which the State had agreed, under the private treaties, to pay and what, in any event, the State was obliged to pay under the provisions of Section 7A, as it then stood on the one hand and the "Book Value" of the undertaking, which the law seeks to substitute on the other.