
206 U.S. 474 (1907)
COPPER QUEEN CONSOLIDATED MINING COMPANY
v.
TERRITORIAL BOARD OF EQUALIZATION OF THE TERRITORY OF ARIZONA.
No. 280.
Supreme Court of United States.
Argued April 26, 1907.
Decided May 27, 1907.
APPEAL FROM THE SUPREME COURT OF THE TERRITORY OF ARIZONA.
*475 Mr. William Herring, with whom Mrs. Sarah Herring Sorin and Mr. Everett E. Ellinwood were on the brief, for appellant.
Mr. Elias S. Clark and Mr. William C. Prentiss, with whom Mr. Horace F. Clark was on the brief, for appellee.
*478 MR. JUSTICE HOLMES delivered the opinion of the court.
THIS is an appeal from a judgment on demurrer to a petition for a writ of certiorari. The object of the petition was to vacate proceedings of the Board of Equalization in 1905, by which the Board added very largely to the assessed valuation of patented mines and, in a less degree, of work horses and saddle horses, in Cochise County and other counties in Arizona. It was alleged that by these proceedings the Board increased the total valuation of property in the Territory and increased the valuation of the petitioner's property of the above-mentioned kinds. The writ had been issued by a single justice returnable before the full bench, but the case was heard on the demurrer by consent, and by the judgment the demurrer was sustained and the writ was quashed.
The errors alleged are two: first, that while the Board for purposes of equalizing might add to the total value of the property in one county and diminish that of property in another, it had no power to increase the total valuation of property in the Territory above the sum of the returns from the Boards of Supervisors of the several counties; and second, that the Board was bound to deal with the valuation of each county as a whole, and could not increase or diminish the valuations of particular classes of property within a county. The power of the Board depends, of course, upon statute, and it is said that the statute of Arizona was taken almost verbatim from one of Colorado, which had been construed by the Supreme Court of that State in accordance with the first of the petitioner's above contentions before it was adopted by Arizona. People v. Lothrop, 3 Colorado, 428. The construction, it is said, goes with the act. Henrietta Mining & Milling Co. v. *479 Gardner, 173 U.S. 123, 130. The second contention is based on an interpretation of the statutes, the supposed absence of an express grant of power, and later decisions in Colorado and other States.
On the other hand, while this court cannot refuse to exercise its own judgment, it naturally will lean toward the interpretation of a local statute adopted by the local court. Sweeney v. Lomme, 22 Wall. 208; Northern Pacific R.R. Co. v. Hambly, 154 U.S. 349, 361; Fox v. Haarstick, 156 U.S. 674, 679. And again, when for a considerable time a statute notoriously has received a construction in practice from those whose duty it is to carry it out, and afterwards is reenacted in the same words, it may be presumed that the construction is satisfactory to the legislature, unless plainly erroneous, since otherwise naturally the words would have been changed. New York, New Haven & Hartford R.R. Co. v. Interstate Commerce Commission, 200 U.S. 361, 401, 402. The statute of Arizona was reenacted in 1901 and was said by the Supreme Court to have been construed by the Board against the petitioner's contention ever since the Board was created, eighteen years before. Even apart from the reenactment a certain weight attaches to this fact. United States v. Finnell, 185 U.S. 236, 243, 244. United States v. Sweet, 189 U.S. 471. The presumption that the codifiers of 1901 knew and approved the practice of the Board certainly is as strong as the presumption that the original enactors of the statute knew a single decision in another State; and it is more important since it refers to a later time.
As an original question the construction adopted by the Supreme Court appears to us at least as reasonable as the opposite one contended for, and the variations in the Arizona act from the prototype, if Colorado furnished the prototype, and the different background against which it was to be construed, seem to us to have warranted the refusal to be bound by the Colorado case.
We give a section of the General Laws of Colorado, 1877, and of the Revised Statutes of Arizona side by side.


*480
   2282. Sec. 43. Said Board shall      3880. (Sec. 50.) The said board
ascertain whether the valuation of   shall ascertain whether the valuation
real estate in each county bears a   of property in each county bears a
fair relation or proportion to the   fair relation or proportion to the
valuation in all other counties of   valuation in all other counties in the
the State, and on such examination   territory, and on such examination
they may increase or diminish the    they may increase or diminish the
aggregate valuation of real estate   valuation of property in any county,
in any county, as much as in their   as much as in their judgment may be
judgment may be necessary to         necessary to produce a just relation
produce a just relation between all  between all the valuations of property
the valuations of real estate in     in the territory; but in no instance
the State; but in no instance shall  shall they reduce the aggregate
they reduce the aggregate valuation  valuation of all the counties below
of all the counties below the        the aggregate valuation as returned by
aggregate valuation as returned by   the boards of supervisors of the
the clerks of the several counties.  several counties. And said board shall
                                     at the same time fix the rate of taxes
                                     for territorial purposes which is to
                                     be levied and collected in each county.

For convenience we take up the second of the alleged errors first. It will be seen that the word "property" takes the place of "real estate" at the beginning, and that the power given, instead being only a power to increase or diminish the aggregate valuation of real estate in any county, is to increase or diminish the valuation of property (not the property) in (not of) any county. The word "aggregate" is left out, and the fact that it was left out favors the construction that apart from that fact would be reasonable, that the power extends to the valuation of any property, and is not confined to the valuation of all the property as one whole. This construction *481 is further favored by the purpose of the changes in valuation, which is to "produce a just relation between all the valuations of property in the Territory." This phrase is interstitial in its working. It does not confine the equality to the valuations by county, but extends it to all the valuations of property. Yet a further argument may be drawn from the language of § 3874: "No assessor, board of supervisors, or the territorial board of equalization shall assess any real estate at a less valuation than seventy-five cents per acre." This recognizes the power of the Board to deal with a special class of property, and we may add, by way of anticipation, by also recognizing a function of assessment, does much to make inapplicable the reasoning of the Colorado decision upon the other point.
It seems to have been argued below that at least the Board was confined to dealing with property by the classes mentioned in other sections of the statutes, especially §§ 3849, 3861, 3877. But the classifications and specifications provided for in those sections do not affect the power expressly given by § 3880 as we have construed the latter, and further, by § 3877 the Territorial Board is given power in very broad terms to change the list. It is not necessary to rely on this power to change the list for the power of the Board to change valuations of a particular class of property. It is mentioned simply to show that the powers given by § 3880 are not diminished by other provisions.
The first contention of the petitioner needs but a few words in addition to what we have said. The power to increase the valuation of property in any county is as power to increase it in all, or, at least, to increase the valuation of some kinds of property in all, so as to produce a just relation between them and the other valuations left undisturbed. We find nothing in the statute that requires the increase to be so adjusted that the total valuation shall be unchanged. On the contrary, the prohibition against reducing it implies that the Board has the power of change and, but for the prohibition, might reduce *482 the total. Therefore it may add to the total since the law does not forbid that. The Colorado decision to the contrary turned partly on the notion, which has been shown to be inapplicable to Arizona, that the Board of Equalization had no function of assessment. It also turned in part at least on the constitution of the State, to which, of course, the statute was subject. There was no Constitution to be conformed to in Arizona and therefore the construction of the statute depends on the meaning of the words alone, and the Supreme Court of the Territory in construing them was left at large.
Judgment affirmed.
