The plaintiff obtained a writ of review from the superior court for the purpose,of annulling an order passed by the board of trustees of Alameda for the improvement of a certain street in that city, and all subsequent proceedings in reference thereto. Upon the return to the writ, and after a hearing thereon, the court rendered its judgment annulling the order for the improvement, “ and that all acts or proceedings taken or had, done or performed, by the said board of trustees, and by the said superintendent of streets, respondents, subsequent to the said twenty-third day of March, 1891, appearing in and by the returns herein, be and the same are hereby annulled and held for naught.” From this judgment -the respondents to the writ have appealed.

The plaintiff does not contend that the resolution of intention to order the improvement is insufficient, or that it was not properly passed by the board of trustees, or that the notices and other proceedings required by the street improvement act in order to give to the board of trustees jurisdiction to order the improvement were not properly given; but it is claimed that the proceedings subsequent thereto were of such a character as to vitiate the order, as well as the contract for doing the work and the assessment issued therefor. Counsel have discussed very fully the sufficiency of these subsequent proceedings, but from the conclusion we have reached upon the proposition of the appellants that the writ was improperly issued, it is unnecessary to pass upon the sufficiency of these proceedings.

At common law the writ of certiorari was employed for the purpose of reviewing the proceedings of inferior *668 tribunals in their exercise of judicial powers, and was issued in cases where the final determinations of those tribunals were not subject to review in any other mode. The writ was considered an extraordinary legal remedy, and was issued in the discretion of the court, and only when there was no other mode of review. This discretion, however, was not arbitrary, but was only a legal discretion controlled by principles of law, and, if improperly exercised, was subject to be corrected on appeal. (Supervisors v. Magoon, 109 Ill. 142 .) As a street assessment in this state can be collected only by means of foreclosure in a court of record, and as the facts relied upon by the plaintiff herein would be available in defense of such action, and if deemed sufficient to establish a want of jurisdiction either for ordering the improvement or awarding the contract, would defeat the action, the discretion of the court would have been properly exercised in denying the writ. (Spooner v. Seattle, 6 Wash. 370 ; People v. Myers, 135 N. Y. 465 .) The writ should never be employed as a substitute for an action to remove a cloud from a title.

The scope of the writ has been limited in this state by the provisions of section 1068 of the Code of Civil Procedure, and it is to be issued only “when an inferior tribunal, board, or officer exercising judicial functions, has exceeded the jurisdiction of such tribunal, board, or officer, and there is no appeal, nor in the judgment of the court any plain, speedy, and adequate remedy;” and by section 1074: “ The review upon this writ cannot be extended further than to determine whether the inferior tribunal, board, or officer has regularly pursued the authority of such tribunal, board, or officer. In Central Pac. R. R. Co. v. Placer County, 43 Cal. 365 , it was held that the clause in section 1074, “whether the inferior tribunal has regularly pursued the authority of such tribunal,” is to be construed as the equivalent of the clause “ has exceeded the jurisdiction of such tribunal” in section 1068. The character of the act or determination sought to be reviewed, rather than of the tribunal or officer by which *669 the act or determination is made, is the test for determining whether the writ should be issued, for it is only a determination which is made “ when exercising judicial functions ” that can be reviewed. “ The officer or tribunal to whom the writ of certiorari is issued must be an inferior officer or tribunal exercising judicial functions, and the proceeding to be brought up for review must be a judicial proceeding.” (People v. Bush, 40 Cal. 344 .)

The functions exercised by a municipal corporation may be legislative, administrative, or judicial, but only the acts done by it “when exercising judicial functions ” can be reviewed under this procedure. “ This writ does not lie under the laws to. review the action of anv tri o v bunal, board, or officer in the exercise of functions which are legislative in their character.” (People v. Oakland Board of Education, 54 Cal. 375 .) Whether an existing street shall be improved, is a question to be addressed to the governing body of a municipality in its legislative capacity, and its determination upon that question, as well as upon the character of the improvement to be made, is a legislative act. (Dillon on Municipal Corporations, secs. 94, 927; Creighton v. Manson, 27 Cal. 613 ; De Witt v. Duncan, 46 Cal. 343 ; Bolton v. Gilleran, 105 Cal. 244 ; 45 Am. St. Rep. 33 .) The act does not cease to be legislative because the members of the city council are required to exercise their judgment in determining whether the improvement shall be made. The judgment which they exercise in ordering the improvement is not a determination of the rights of an individual under existing laws, but is the conclusion or opinion which they form in the exercise of the discretionary power that has been intrusted to them, and upon a consideration of the public welfare and demands for which they are to provide. This discretion and opinion is a part of the legislative power that has been conferred upon the city, and is of the same character as that exercised by the legislature itself in providing for the general welfare of the state, and is equally independent of supervision by the judici *670 ary. The adoption- by the city council of an order for the improvement of a street is not in the nature of a judgment .which is binding upon the city, but is merely the declaration of a purpose, and is only a step taken by it in contemplation of the improvement, from which it may recede at any time before a contract for the improvement has been awarded. The fact that a public agent exercises judgment and discretion in the performance of his duties does not make his action or powers judicial in their character. (People v. Walter, 68 N. Y. 403 ; People v. Board of Commrs., 97 N. Y. 37 ; In re Wilson, 32 Minn. 145 .) The distinction between a judicial and a legislative act was pointed out by Field, J., in Sinking-Fund cases, 99 U. S. 761 , as follows: “The one determines what the law is, and what the rights of parties are with reference to transactions already had; the other prescribes what the law shall be in future cases arising under it.” In People v. Oakland Board of Education, supra, this rule was accepted by this court as correct, and it "was said with reference to the matter then before the court: “The board acted upon the proposition before it as one of policy or expediency, aiming to adopt that which in its judgment would be best for the constituency which it represented. Its action was then political or legislative, and was in no proper sense judicial in its character. It is conceded that the board exercised its judgment in the action which it took, but this it was called to do in the exercise of its legislative functions. It is apparent that the exercise of judgment is not the criterion by which this proceeding must be viewed to determine its character. To render it the exercise of a judicial function, its judgment must act in a matter which is judicial in the sense above indicated.” In the opinion given by Mr. Justice McKinstry, in Spring Valley Water Works v. Bryant, 52 Cal. 132 , this subject received an extended examination, and it was said: “From the foregoing and other cases heretofore decided it'

Although the question has not been discussed by counsel, we do not wish to be understood as sanctioning, even by silence, the practice herein adopted by the plaintiff in joining with the board of trustees, in the writ, the superintendent of streets and the contractor. The statute provides that the writ is to be directed to the inferior tribunal, board, or officer, or to any other person having the custody of the record or proceedings to be certified (Code Civ. Proc., sec. 1070), and, as the review is limited to examining the jurisdiction of the board or officer to whom the writ is issued, there is a manifest impropriety in joining in the same proceeding tribunals or officers who exercise a jurisdiction separate and distinct from each other. Jurisdiction is in its nature an entirety, and exclusive in the body or person upon whom it has been conferred, and a writ of certiorari directed to different officers having no joint or common duties, but acting each independently of the *672 other, is unauthorized. (People v. Walter, supra; Starr v. Rochester, 6 Wend. 564 .) In the matter sought to be reviewed the functions of the superintendent of streets and of the board of trustees are entirely distinct, and that officer should not have been included.in the writ. It is difficult to see upon what grounds the contractor was joined with the others, as no jurisdiction is exercised by him, and he did not even make any return to the writ. The superintendent of streets can exercise no jurisdiction until after the board of trustees have by their acts conferred such jurisdiction upon him, and the jurisdiction which he exercises is distinct from that exercised by the trustees. An appeal may be taken to them from the assessment made by him, and from other acts or determinations of his. Upon such appeal the city'council for the first time exercises judicial functions (see Barber v. San Francisco, 42 Cal. 630 ); but the making of the assessment by the superintendent is but a clerical or ministerial act. Under the system adopted in this state the assessment consists merely in an apportionment of the expenses of the work upon the land fronting thereon. The rule for this apportionment has been fixed .by the legislature, and the superintendent of streets in making the assessment is not in the exercise of any judgment or discretion, but merely performs the clerical functions of making an arithmetical computation of the amount to be charged against each lot. (Bolton v. Gilleran, supra.) The cases cited from other states, where the assessment upon each lot is to be made according to the benefits which that lot has received from the improvement, and in which it has been held that the parties to be affected by his acts are entitled to notice and an opportunity to be heard before a legal charge can be made against their property, are, therefore, inapplicable. The statute, moreover, provides for an appeal to the city council from the act of the superintendent in making the assessment, and thus by express terms takes away the right to invoke the aid of a court to set aside the assessment by *673 means of a writ of review. ( Wright v. Highway Comm’rs., 150 Ill. 138 ; People v. Thayer, 88 Hun, 136 .) In the present case such appeal was taken and the assessment affirmed.

The judgment is reversed, and the superior court is directed to dismiss the writ.

Garoutte, J., and Van Fleet, J., concurred.