delivered the opinion of the Court:
Two questions are presented by the assignment of errors, which allege in substance that the court below erred in holding that the appellant is not a regularly incorporated institution of learning within the meaning of the act of July 16, 1894, and that it is not entitled to transmit through the mails its publication at the second-class rate of postage.
1. Appellant’s counsel states the first question to be:
“Is an incorporated joint-stock company conducting a correspondence college for the gain and profit of its shareholders, a 'regularly incorporated institution of learning’ within the meaning of the act of July 16, 1894?”
'The act of July 16, 1894, referred to, is:
“That from and after the passage of this act all periodical publications issued from a known place of publication at stated intervals, and as frequently as four times a year, by or under the auspices of a benevolent or fraternal society or order organized under the lodge system and having a bona fide membership of not less than one thousand persons, or by a regularly incorporated institution of learning, or by or under the auspices of a trades union, and all publications of strictly professional, literary, historical, or scientific societies, including the bulletins issued by State boards of health, shall be admitted to the mails as *152second-class matter, and the postage thereon shall be the same as on other second-class matter, and no more; Provided, further, That such matter shall be originated and published to further the objects and purposes of such society, order, trades union, or institution of learning, and shall be formed of printed paper sheets without board, cloth, leather, or other substantial binding* such as distinguished printed books [28 Stat. at L. 105, chap. 137, U. S. Comp. Stat. 1901, p. 2653] for preservation from periodical publications.”
This court, in United States ex rel. Chicago Business College v. Payne, 20 App. D. C. 606, had occasion to pass upon the same question as the one here raised, and its conclusion was that a corporation similar to the appellant was not an institution of learning within the meaning of the act of Congress referred to. The reasons upon which its conclusion was based are fully set forth in the opinion of the court in that case, and it would be a work of supererogation to restate them. We are asked, however, to review that decision in the light of the additional facts presented. We fail to find anything in the record which is sufficient to differentiate the cases so as to lead to a contrary decision in the one at bar. It is true the proceedings are different in form, the former one asking for a writ of mandamus to compel the Postmaster General to admit a publication to the mails as second-class matter, while in the present case an injunction is sought to prevent that officer from canceling or revoking a certificate of entry of a publication to the mails as second-class matter. In our opinion the form of remedy does not affect the question at issue, and, if this court was correct in its interpretation of the statute, its decision should stand, whether relief by injunction or by mandamus bo sought. It is further argued that this court, in the prior case, should have passed upon the question of its jurisdiction to review the departmental action, and that until that question was decided it could not lawfully determine questions arising on the merits. We do not consider that there is anything in this contention which robs the decision in that case of its weight as an authority. Under the circumstances of that case this court was *153clearly justified in considering the merits. In Bates & G. Co. v. Payne, 194 U. S. 106, 48 L. ed. 894, 24 Sup. Ct. Rep. 595, involving an analogous question, it was aptly said:
“Upon this principle, and because we thought the question involved one of law rather than of fact, and one of great general importance, we have reviewed the action of the Postmaster General in holding serial novels to be books rather than periodicals; but it is not intended to intimate that in every case hereafter-arising the question whether a certain publication shall be considered a book or a periodical shall be reviewed by this court. In such case the decision of the Postoffice Department, rendered in the exercise of a reasonable discretion, will be treated as conclusive.”
The court below correctly ruled that the appellant was not a. regularly incorporated institution of learning within the meaning of the act of July 16, 1894, and the question raised must be-answered in the negative.
2. The second proposition is thus 'stated:
“Does the constrirction placed upon the statute in 1894 by the then Postmaster General, after correspondence with the House of Eepresentatives and an official declaration by that body, through its presiding officer, at the time of the passage of the bill, that the act would confer upon publishers in the position of complainant the privilege claimed, bind the present Postmaster General, and require that he shall await legislative change before giving a different construction to the act ?”
This question must also be answered in the negative, under the authority of Houghton v. Payne, 194 U. S. 88, 48 L. ed. 888, 24 Sup. Ct. Rep. 590, 22 App. D. C. 234. The court there laid down a rule which we must follow in this case. It said:
“Great stress is laid by counsel upon the original interpretation of the term ‘periodical/ as applied to these books, which, it is said, was continued without change under different administrations and by several successive Postmasters General, and from 1879, the date of the passage of the act, until 1902, when the certificates granted by the former Postmasters General were revoked by the defendant, and a different classification made of *154the publications now in issue; that the attention of Congress Avas repeatedly called to the evils and to the large expense incurred by the goAurnment by the admission of publications of this description to mail matter of the second class; that Congress seriously considered these representations, and committees made voluminous report thereon, yet Congress persistently refused to change by legislation the ruling of the Postmasters General in that regard.
“The action of the government consists merely in the revocation of a certificate or license admitting these publications as mail matter of the second class. No vested right having been created by such certificate, no contract can be said to be impaired by its revocation.
“Contemporaneous construction is a rule of interpretation, but is not an absolute one. It does not preclude an inquiry by the courts as to the original correctness of such construction. A' custom of the department, however long continued by successive officers, must yield to the positive language of the statute.
“While it might well happen that by reason of the relative unimportance of the question when originally raised a too liberal construction might have been gWen to the Avord 'periodical/ Ave cannot think that if this question had been raised for the first time after second-class mail matter had obtained its present proportions, a like construction would have been given. Some consideration, in connection Avith the revocation of these certificates, may properly be accorded to the great expense occasioned by this interpretation, and the discrimination in favor of certain publishers and against others, to which allusion has already been made. We regard publications of the Riverside Literature Series as too clearly within the denomination of books to justify us in approving a classification of them as periodicals, notwithstanding the length of time such classification obtained.”
Furthermore, it will be remembered that this case was heard and determined on the bill and ansAver, and in the latter the defendants make this averment:
“That it was never expressly held or determined by any of *155"their predecessors that any incorporated joint-stock company engaged in the business of education, for the personal or pecuniary profit of the owners or stockholders thereof, was a ‘regularly incorporated institution of learning’ within the meaning of the act of July 16, 1894.”
We find that there was no error in the court below. It follows that the decree appealed from must be affirmed with costs, and it is so ordered. Affirmed.
An appeal to the Supreme Court of the United States by the appellant was allowed April 6, 1905.