delivered tbe following opinion:
What is called the Ponce & Guayama Railroad Company, the complainant herein, is apparently not a single corporation, but an association in the nature of a partnership or a syndicate between three different corporations. Two of these were the Centrals Aguirre and Fortuna, owning 58 of the 61 kikn meters of railroad between Guayama and Ponce. The remaining 3 kilometers were owned by the defendant, the American Railroad Company of Porto Rico. The three companies entered into an agreement, approved by the executive council of Porto Rico, by which the American Railroad Company was to operate through trains, passenger, freight, and mixed, over the line between Ponce and Guayama, receiving certain compensation for operating and auditing expenses, and the net balance was to be divided among the three corporations in certain proportions. This contract was to last for one year from October 1, 1911, and, although renewed for several years subsequently, the dispute now in question relates only to this first year. While the contract provided for passenger, freight, and mixed trains, in point of fact it was found expedient to operate only a mixed train, that is one composed of passenger coaches and freight cars. The contract provided for 50 cents per train per kilometer to the American Railroad Company for passenger and freight service. Settlement under the contract was to be at the end of the period, which was one year. In point of fact, however, the American Railroad Company rendered monthly statements to each of the associate companies, showing all details connected with the operation, remitted the proportionate compensation and a bill for the 50 cent services. These bills were paid by the complainant without question *134until at the end of the period a final settlement was bad, and then complainant first objected to the 50 cent charge as applicable under the contract to freight services and to passenger services, but not to the mixed train service, — the only service actually rendered. The amount involved is not disputed, for it is stated by the complainant in his bill as $20,652.57, as made up from the defendant’s own statements.
' The suit now comes up upon the merits and upon a motion to dismiss for want of equity. This requires a consideration of the basis of the bill.
1. The bill purports to be one for an accounting, and there is no question that a complicated account is one of the grounds of equity jurisdiction. In this case, however, there would seem to be no complicated account involved, for if there was ever any complication, it has been resolved by statements made and agreed upon between the parties. It is not every matter of account that is cognizable in equity, for if this were true a bill for dry goods and groceries could be tried in chancery. It would not seem that a case where an account is agreed upon would give jurisdiction to a court of equity. Fowle v. Lawrason, 5 Pet. 495, 8 L. ed. 204; Baker v. Biddle, Baldw. 394, Fed. Cas. No. 764; Pom. Eq. Jur. § 178. A party cannot by any colorable suggestion of fraud, account, etc., use a bill in equity in place of the common-law remedy. Lewis v. Cocks, 23 Wall. 466, 23 L. ed. 70.
2. The ground of account, however, is re-enforced by that of mistake. It is alleged in the bill, and sought to be shown by the testimony, that the defendant was mistaken in its interpretation of the contract, and that the complainant either fell into the same mistake or acquiesced therein temporarily, *135but has now raised the point before any rights are vested one way or the other. A mistake must be either of fact or of law. If of law, there is no remedy in any court. People are supposed to know the law and are held accountable accordingly. If, however, it was a mistake of fact, then that is not necessarily a ground of equitable jurisdiction. It may be so in some cases, but where the mistake is one which can be remedied at law, there is no reason for pursuing a remedy in equity. Lesslie v. Eichardson, 60 Ala. 563; Youngblood v. Youngblood, 54 Ala. 486. Is this, then, such a mistake as is cognizable at law? If so, there is an adequate remedy at law, and nothing can be taken in equity.
3. TJnder the allegations of the bill, here is a case of accounting from time to time under a wrong conception, perhaps mutual, of the meaning of a contract, resulting at the end of the contract period of one year in a mistake against the complainant of some $20,000. If it were a mistake as alleged, it is a mistake of construction of the contract, under which one party has retained money which ex equo et bono belongs to the other. So far as the amount in controversy is concerned it is a pure matter of calculation, and indeed has been calculated in the bill itself, and is not disputed in the answer. Baker v. Biddle, Baldw. 394, Fed. Cas. No. 764. A mere matter of recovery of money is cognizable in a court at law, and to that extent is not cognizable in a court of equity. The 7th Amendment to the Constitution provided that “in suits at common law where the value in controversy shall exceed $20, the right of trial by jury shall be preserved.” Carrying out this principle it is provided in Revised Statutes, § 648, Comp. Stat. 1913, § 1584, that the trial of issues of fact in the circuit courts shall *136be by jury except in causes of equity, and under § 723 of the [Revised Statutes, “suits in equity shall not be sustained in either of the courts of the United States in any case where a plain, adequate, and complete remedy may be had at law:” The recovery of a money judgment must be at law. Whitehead v. Shattuck, 138 U. S. 151, 34 L. ed. 874, 11 Sup. Ct. Rep. 276. “Whenever one person has in his hands money equitably belonging to another, that other may recover it by assumpsit for money had and received. . . . The remedy at law is adequate and complete.” Gaines v. Miller, 111 U. S. 395, 28 L. ed. 466, 4 Sup. Ct. Rep. 426.
4. Besides invoking the equity jurisdiction as to account and mistake, the complainant alleges that the defendant company stood in a fiduciary relation to the complainant, and therefore the bill invokes the equitable jurisdiction over trusts. It is true that the defendant collected and disbursed all the money taken in under the contract. This, however, did not make it so much a trustee as an agent, perhaps even in the nature of a cashier or bookkeeper. At all events, whatever the nature of the relation, it had under the allegations of the bill been reduced to the one in which the defendant retained the money, whose amount is clearly fixed, which belongs to the complainant. There is in this not a trust in the technical sense of the word, but a debt.
5. There is one point of view which has not been fully discussed in the argument. There was either a final settlement between the parties, or a number of partial settlements which could be added up into a final settlement. Under such circumstances can a court of equity revise the settlement between parties? Says Pomeroy: “Section 1421. The instances in which *137tbe legal remedies are beld to be inadequate, and therefore a suit in equity for an accounting proper, are: 1. Where there are mutual accounts between the plaintiff and the defendant,' — - that is, where each of the two parties has received and paid on account of the other; 2. Where the accounts are all on one side, but there are circumstances of great complication, or difficulties in the way of adequate relief at law; 3. Where a fiduciary relation exists between the parties, and a duty rests upon the defendant to render an account. A plea of stated account obviously constitutes a bar to a suit in equity for an accounting, since in that case the remedy at law is entirely adequate ; but, of course, a stated account may be opened for fraud or error.” 4 Eq. Jur. § 1421.
The facts of this case would not under these principles authorize opening the settlement in equity. There is no fraud alleged, and no error apparent that cannot be handled as well in a court of law as in a court of equity.
6. Under the old practice, therefore, the motion to dismiss for want of equity must have prevailed. The new rules in equity, however, call for a different procedure. E-ule 22 provides that “if at any time it appear that a suit commenced in equity should have been brought as an action on the law side of the court, it shall be forthwith transferred to the law side, and he there proceeded with, with only such alteration in the pleadings as shall be essential.” The proper order in this court, if any be made, must be not that the case be dismissed, but that it be transferred to the law docket of this court.
Y. The defendant, however, sets up that the money in question has been voluntarily paid, and therefore cannot be recovered back on either side of this court, or in any court. There *138is no question about this principle. United States v. New York & C. Mail S. S. Co. 200 U. S. 488, 50 L. ed. 569, 26 Sup. Ct. Rep. 327; Chesebrough v. United States, 192 U. S. 253, 48 L. ed. 432, 24 Sup. Ct. Rep. 262. If tbis money was voluntarily paid, tbe court will leave tbe parties where it finds them. Parties cannot bave business dealings in wbicb they voluntarily settle matters and afterwards change their mind and come into •court for redress. In case of money paid under a mistake of fact, if tbe party has been guilty of negligence or of a breach •of bis proper duty in tbe transaction, be is not entitled to recover back against tbe other party whose rights or conduct bave not been affected by such fact. Bend v. Hoyt, 13 Pet. 263, 10 L. ed. 154. Is tbis such a case?
Tbe transaction as set out in tbe bill and as testified to by witnesses was one in wbicb there was to be a final settlement at tbe end of tbe contract period. There bad been partial settlements before then, in fact every month, but partial settlements, because tbey are partial, must be open to re-examination at a final settlement. Unless distinctly agreed that tbey are absolute fro tanto, tbey are subject to re-examination at tbe final settlement. Under tbe contract at bar there is only one settlement provided for, and that is tbe one at tbe end of tbe period, and complaint was made in connection with tbis. It •cannot be said that a payment is voluntarily made when it relates to a continuous account wbicb is not to be closed until later, and when at tbe final closing tbe matter of these payments is reopened.
It is difficult to see under tbe principle of Bend v. Hoyt, supra, in what respect tbe defendant was injured by tbe complainant’s not making objection earlier. It might well be *139that monthly accounts would pass through the hands of different officials from those who would pass upon annual accounts. The defendant under the contract kept the books and it is not .at all necessary for the complainant to object (under penalty of losing his own rights) until the time fixed by the contract itself, for a settlement. These circumstances hardly amounted to a contemporaneous practical construction of the contract by the parties under the principle of State Trust Co. v. Duluth, 104 Fed. 632. The terms of the contract as to time of settlement are the law of this case.
8. It cannot be said that the complainant is without fault in this matter. If it had complained on the first presentation of a statement, it may be that the matter would have been rectified without suit. At all events, having brought the suit in the wrong manner, complainant should pay the costs of the proceedings up to this time. It may be that Equity Rule No. 22 identifies the proceedings upon the two sides of the court for all practical purposes, including statute of limitations, but it does not change the fact that a new proceeding is necessary in form, and the party who has brought the suit in the wrong manner must, on the same principle as the loser in an ordinary suit, be taxed with the costs of that erroneous proceeding.
The submission in this cause is therefore set aside, and the motion to dismiss for want of equity is granted to the following extent:
(1) Complainant has ten days within which to amend his ■complaint so as to meet the evidence which has been submitted and show some ground of equity jurisdiction.
(2) If such amendment is not made the clerk will transfer the cause to the law docket of this court. Complainant there*140upon bas twenty days witbin wbicb to malee sucb alteration in tbe pleadings as shall be essential to tbe new form of suit.
(3) Upon sucb transfer tbe complainant herein shall pay tbe costs of tbe suit on tbe equity side of this court.