jection to stating the grounds of substantive law which seem to-us to support the result.” Holmes, C. J., in Browne v. Turner, 176 Mass. 9,12. To that end and for the same reason the amendment is allowed admitting the present Treasurer and Receiver General in place of the one named in the petition, who has vacated that office.
In an opinion of the justices given to the honorable Senate and reported in 231 Mass. 603, the view was expressed that Spec. St. 1918, c. 159, violated no provision of the State or Federal Constitutions. The familiar rule is that such opinions are wholly advisory, given by the justices as individuals without the benefit of argument, and are not decisions of the court. When the questions therein considered arise in the course of litigation, the ground is re-examined by the justices sitting as a court in the light of the arguments presented and with the effort carefully to guard against any influence flowing from the earlier opinion. Young v. Duncan, 218 Mass. 346, 351, Perkins v. Westwood, 226 Mass. 268, 272, and cases collected in each judgment.
The allegations of the bill in substance are that by virtue of St. 1902, c. 534, and St. 1911, c. 741, the city of Boston has' expended about $31,000,000 in the construction of subways and tunnels and has leased the same to the railway company, whereby all these subways and tunnels and also those built by it under earlier statutes, and the rents and profits thereof, are held by the city “in its private or proprietary capacity, for its own property” never to be taken by the Commonwealth except on payment of just compensation. The leases, which have been extended to July 1, 1936, provide for repairs by the lessee and maintenance of the demised property in good condition, and give the city the right of entry upon default in payment of rent. The essential parts of said c. 159 are stated in or by reference imported into the bill. That act provides for public operation of the railway through a board of five trustees appointed by the Governor, who “shall manage and operate the Boston Elevated Railway Company . . . and the properties owned, leased or operated by it, for a period of ten years,” and thereafter upon the same terms until such time as the Commonwealth shall elect to discontinue public management and operation, and who, subject to the provisions of the act, “shall take and have possession of said properties in behalf