TRAYNOR, J.

Plaintiff, as trustee in bankruptcy, brought this action to recover on a policy of fire insurance issued to the bankrupt, Kwan Tow. The policy follows the standard form prescribed by the Insurance Code, sections 2070 and 2071. It requires the insured to give the insurer written notice of loss without unnecessary delay; to separate the damaged property from that which is undamaged and put it in the best possible order; to make an inventory stating the quantity and cost of each item, and the amount claimed thereon; to submit detailed preliminary proof within sixty days after the fire; to submit the amount of loss to arbitration if the insurer does not assent to the amount claimed within twenty days after receipt thereof or if an agreement is not otherwise reached. The policy also provides that "A loss hereunder shall be payable in thirty days after the amount thereof has been ascertained either by agreement or by appraisement . . ." and that "No suit or action on this policy for the recovery of any claim shall be sustained, until after full compliance by the insured with all the foregoing requirements, nor unless begun within fifteen months next after the commencement of the fire."

The complaint incorporates the policy by reference and alleges that plaintiff was appointed trustee of the bankrupt's estate on September 20, 1939; that on September 27, 1939, the property insured was partially destroyed by fire; that on November 18, 1939, plaintiff and the insured submitted proof of loss to defendant as required by the policy; that plaintiff and the insured have performed all the conditions set forth in the policy; that on December 22, 1939, plaintiff and defendant's agent entered into an agreement fixing the amount of loss at $1,160.25; that defendant denied all liability under the policy on the grounds that at the time of the fire the insured was not the sole and unconditional owner of the insured personal property, that at the time of the destruction of the property there was a change in "the interest in, title to, or possession of the subject of insurance," and that under the terms of the policy such a change has made the policy void. The complaint alleges further that on January 15, 1940, shortly after the plaintiff was advised that the defendant denied all liability under the policy, he brought suit in the Superior Court of San Joaquin County to recover on the policy and on defendant's motion the action was transferred to the Municipal Court of the City and County of San Francisco; that defendant requested and obtained from plaintiff and the court numerous continuances and extensions of time thereby delaying the time of trial until January 8, 1941; that after plaintiff presented his evidence, defendant moved for a nonsuit upon the ground that the action had been prematurely filed because thirty days had not elapsed from the time of agreement upon the amount of loss; that the motion was granted and judgment upon the nonsuit entered February 21, 1941; that on February 25, 1941, plaintiff filed the present action in the Superior Court of Contra Costa County alleging that plaintiff learned for the first time on January 8, 1941, the time of trial of the first action, that defendant was relying upon the defense that the action was premature and that had he known earlier he would have dismissed that action and filed a new one within the time permitted by the policy; that this defense was not set up or disclosed in defendant's demurrer or answer in that action and that by reason of this fact and the numerous continuances and extensions of time obtained, defendant waived the requirement that suit be commenced fifteen months from the time of the fire. Defendant demurred, claiming that the action was barred because it was commenced more than fifteen months after the fire. The trial court sustained the demurrer without leave to amend and entered judgment for defendant. Plaintiff appeals.

This appeal is not from the judgment of nonsuit given in the municipal court, nor is the purpose of this appeal or this decision to attack that judgment collaterally, for its effect as res judicata on the issue of nonsuit is conceded. [1] A nonsuit, however, does not prevent another action from being brought or maintained, and if pleaded in bar is not res judicata on the merits or on any other issue than that of the nonsuit itself. ( Gates v. McLean, 70 Cal. 42 [11 P. 489]; Slocum v. New York Life Ins. Co., 228 U.S. 364 [33 S.Ct. 523, 57 L.Ed. 879].) Plaintiff does not contend that the municipal court did not have jurisdiction to try the case or that the nonsuit is not binding on him but admits its validity and urges this court to declare that its scope and evidentiary value against him does not bar his present attempt to secure a hearing on the merits. The action in which this appeal is taken is essentially the same as that in which the nonsuit was granted, for the parties, facts, and cause of action are identical, and but for the granting of defendant's motion for nonsuit this action would not have arisen. The proceedings in the municipal court cannot be ignored in reviewing the factual background of this action. They are indeed the very facts and only facts on which defendant's demurrer must stand or fall. From the statement of facts in the complaint, which were not denied, and which, for the purpose of ruling on the demurrer, are therefore to be taken as true, it clearly appears that defendant's motion for nonsuit should have been denied. [2] The action was not premature. Plaintiff, from the time he succeeded to the rights of the bankrupt under the policy of insurance upon which this action is founded to the time of this appeal, faithfully performed all conditions required of the insured by the terms of the policy. If defendant had not denied liability the loss would have been payable under the terms of the policy thirty days after the parties had agreed upon the amount thereof. Defendant, however, unconditionally denied liability, leaving plaintiff no alternative but to sue to enforce the claim of the bankrupt. The period of thirty days is allowed an insurance company so that it will have time to investigate to determine its course of action in response to a claim against it. It may exercise the option given it in the policy to "repair, rebuild or replace" the damaged building or machinery "within a reasonable time" on giving notice of its intention to do so; it may decide to pay the loss agreed upon; or it may determine that it has a valid defense to the claim of liability. If an insurance company unconditionally denies liability it would serve no purpose to require the insured to delay suit further. As the court declared in Paez v. Mutual Indem. etc. Ins. Co., 116 Cal.App. 654, 660 [ 3 P.2d 69], "The obvious purpose of the provision inhibiting the institution of an action within the sixty-day period is to permit the company to make an investigation of the circumstances surrounding the loss, but if the company makes an outright denial of liability there can be no excuse for delay in commencing an action for the purpose of determining whether the company's claim of nonliability is well taken. It would be an idle act to insist upon compliance with the requirement for delay in bringing an action which the law 'neither does nor requires.' (Civ. Code, sec. 3532; Farnum v. Phoenix Ins. Co., [ 83 Cal. 263 (23 P. 869, 17 Am.St. Rep. 233)] supra.)" [3] The rule is therefore settled in this court, as in the federal and most state courts, that an unconditional denial of liability by the insurer after the insured has incurred loss and made claim under the policy gives rise to an immediate right of action. ( Paez v. Mutual Indem. etc. Ins. Co., supra; Williams v. Hartford Ins. Co., 54 Cal. 442, 448 [35 Am.Rep. 77]; Carroll v. Girard F. Ins. Co., 72 Cal. 297, 299 [13 P. 863]; Millard v. Legion of Honor, 81 Cal. 340, 349 [22 P. 864]; Farnum v. Phoenix Insurance Co., 83 Cal. 246, 263 [23 P. 869, 17 Am.St.Rep. 233]; McCollough v. Home Ins. Co., 155 Cal. 659, 663 [ 102 P. 814, 18 Ann. Cas. 862]; Wilkinson v. Standard Acc. Ins. Co., 180 Cal. 252, 258 [ 180 P. 607]; Grant v. Sun Indemnity Co., 11 Cal.2d 438, 440 [ 80 P.2d 996]; Lee v. United States Fire Ins. Co., 55 Cal.App. 391, 395-96 [ 203 P. 774]; Francis v. Iowa Nat. Fire Ins. Co., 112 Cal.App. 565, 573-74 [ 297 P. 122]; Hill v. Mutual Benefit Health etc. Assn., 136 Cal.App. 508, 512 [ 29 P.2d 285]; Fohl v. Metropolitan Life Ins. Co., 54 Cal.App.2d 368, 383 [ 129 P.2d 24]; Trousdell v. Equitable Life Assur. Soc., 55 Cal.App.2d 74, 84 [ 130 P.2d 173]; see 7 Couch on Insurance (1930), § 1656b, pp. 5755-56 and Cum.Supp. p. 83, citing cases in support of the general rule from the Supreme Court of the United States, Canada, and twenty-eight state courts; 5 Joyce, Insurance, (2d ed.), § 3211; Civ. Code, § 1440; cf. dictum in Genuser v. Ocean Accident etc. Corp., 57 Cal.App.2d 979, 983 [ 135 P.2d 670].) The desirability of the rule is apparent, for if a waiting period were necessary notwithstanding the election of the insurer to deny liability, it would become a trap for the unwary, and would encourage dilatory tactics as in the present case. Irwin v. Insurance Co. of North America, 16 Cal.App. 143 [ 116 P. 294] and Borger v. Connecticut Fire Ins. Co., 29 Cal.App. 476 [ 156 P. 70] are therefore disapproved.

The insurance policy incorporated by reference in the complaint is of the usual complexity. While courts are diligent to protect insurance companies from fraudulent claims and to enforce all regulations necessary to their protection, it must not be forgotten that the primary function of insurance is to insure. [4] When claims are honestly made, care should be taken to prevent technical forfeitures such as would ensue from an unreasonable enforcement of a rule of procedure unrelated to the merits ( Grant v. Sun Indemnity Co., supra; Glickman v. New York Life Ins. Co., 16 Cal.2d 626 [ 107 P.2d 252, 131 A.L.R. 1292]; 13 Appleman, Insurance Law and Practice (1943), § 7385, p. 37; see New York Life Ins. Co. v. Eggleston, 96 U.S. 572, 577 [24 L.Ed. 841]; Kansas City Life Ins. Co. v. Davis, (C.C.A. 9) 95 F.2d 952, 957; American Credit Indemnity Co. v. W.K. Mitchell Co., (C.C.A. 3) 78 F.2d 276, 277-78; Langmaid, Waiver and Estoppel in Insurance Law, 20 Cal.L.Rev. 1, 40-41; 7 U.Pitt.L.Rev. 148-50).

[5] Defendant's position would not be improved had the action in fact been premature, for defendant had lost the privilege to urge this defense by failing to plead it plainly and to assert it promptly. Dilatory tactics are not favored by the law, for they waste the court's time, increase the cost of litigation unnecessarily, and may easily lead to abatement of an action on purely technical grounds after the statute of limitations has run. (1 C.J.S. Abatement and Revival, § 193; Bemmerly v. Woodward, 124 Cal. 568, 574 [57 P. 561]; Realty Rebuilding Co. v. Rea, 184 Cal. 565 [ 194 P. 1024]; Seches v. Bard, 215 Cal. 79 [ 8 P.2d 835]; California Thorn Cordage, Inc. v. Diller, 121 Cal.App. 542 [ 9 P.2d 594].) Defendant's plea of prematurity was a dilatory plea in abatement, unrelated to the merits and not asserted for nearly a year after plaintiff's action was filed. Under these circumstances defendant loses its privilege to raise it.

[6] Defendant contends, however, that the defense was properly pleaded by the following language in its answer: "that neither the whole of said loss nor any part thereof was or is due, owing or payable to plaintiff or to Kwan Tow or to anyone at the time of the commencement of this action, at the present time or at any other time, or at all. . . ." It cites cases holding that such a denial is sufficient to raise the issue of prematurity. None of the cases cited, however, involved a delay so long that the policy limitation period expired or the failure promptly to assert the defense. There is nothing in the language quoted to put plaintiff on notice of anything other than a general denial of liability under the policy. Defendant's requests for additional time did not indicate any intent to rely on premature filing, for extensions of time for trial are not necessary to raise the defense of prematurity. [7] While courts are indulgent in granting continuances to litigants to allow them a reasonable time to prepare for a trial on the merits, they must also guard against imposition and unreasonable delays. ( Estate of Bollinger, 145 Cal. 751, 753 [ 79 P. 427]; Light v. Richardson, 3 Cal. Unrep. 745, 746-47 [31 P. 1123]; see Code Civ. Proc., §§ 594a, 595, 596.) Not only was there nearly a year's delay in the present case but the nonsuit prevented a trial on the merits.

[8] Under the circumstances it would be a perversion of the policy of the statute of limitation to deny a trial on the merits. As the Supreme Court of the United States declared in Order of R. Telegraphers v. Railway Exp. Agency (1944), 321 U.S. 342, 348 [64 S.Ct. 582, 88 L.Ed. 788], "Statutes of limitation . . . in their conclusive effects are designed to promote justice by preventing surprises through the revival of claims that have been allowed to slumber until evidence has been lost, memories have faded, and witnesses have disappeared. The theory is that even if one has a just claim it is unjust not to put an adversary on notice to defend within the period of limitation and the right to be free of stale claims in time comes to prevail over the right to prosecute them. Here, while the litigation shows no evidence of reckless haste on the part of either party, it cannot be said that the claims were not timely pursued." (See, also, 190 Law Times 303-05.) The short statutory limitation period in the present case is the result of long insistence by insurance companies that they have additional protection against fraudulent proofs, which they could not meet if claims could be sued upon within four years as in the case of actions on other written instruments (Code Civ. Proc., § 337). Originally the shortened limitation periods were inserted into policies by insurers. Some courts declared such provisions void as against public policy while other courts enforced them in order to protect freedom of contract. (See cases collected, 41 Yale L.J. 1069-75.) In refusing to permit a short limitation period to defeat a claim that had been brought in good time and diligently pursued, the court in Genuser v. Ocean Accident etc. Corp., 57 Cal.App.2d 979, 986 [ 135 P.2d 670], declared "We assume that the limitations of time within which suit may be brought which are commonly found in insurance policies are placed there in good faith and to serve a wholly proper and meritorious purpose. We do not doubt that experience has demonstrated the wisdom of providing by contracts of insurance shorter periods for the institution of actions than those provided by law, but the purpose of such limitations is to obtain the advantage of an early trial of the matters in dispute and to make more certain and convenient the production of evidence upon which the rights of the parties may depend" but "it is clear to us that defendant's conduct furnished the occasion for the delay and that it cannot take advantage of a situation which was of its own creation." Under the circumstances of the present case it would be manifestly unjust for this court to prevent a trial on the merits, which the law favors ( Berri v. Rogero, 168 Cal. 736, 741 [ 145 P. 95]; Waybright v. Anderson, 200 Cal. 374, 377 [ 253 P. 148]; 13 Cal.L.Rev. 363), thereby incurring a technical forfeiture of the insured's rights, which the law discourages ( Grant v. Sun Indemnity Co., supra; Glickman v. New York Life Ins. Co., supra; see 7 U.Pitt.L.Rev. 148), by enforcing the fifteen-month limitation period when the prior action was filed promptly and long before the period expired.

[9] The statutes of most states provide that when an action is brought in good time and diligently pursued, but defeated by some technicality unrelated to the merits, a new action may be brought within a certain period, usually six months or a year, which shall be deemed a continuance of the former action. These statutes have their origin in section 4 of the English Limitation Act of 1623. ( Wood v. Carpenter, 101 U.S. 135, 139 [25 L.Ed. 807]; Gaines v. City of New York, 215 N.Y. 533, 537 [ 109 N.E. 594, Ann.Cas. 1916A 259, L.R.A. 1917C 203].) Although there is a conflict in the cases where the limitation period is contractual, in the several jurisdictions, except Michigan, that have adopted a standard form of insurance policy by statute, as California has, it has been held that these or other remedial statutes designed to prevent technical forfeitures under statutes of limitation also apply to the limitation period incorporated by statute into every insurance policy. (See cases collected in 23 A.L.R. 97, 106-109; 149 A.L.R. 483, 491-492.) The reason for such a rule has particular force when the Legislature has shortened the limitation period from four years, controlling actions on other written instruments (Code Civ. Proc., § 337), to fifteen months on fire insurance policies (Ins. Code, § 2071), since the probability of technical forfeiture is all the greater. The California counterpart of such statutes is section 355 of the Code of Civil Procedure, copied from section 84 of the New York Code of Procedure, which in turn was based on section 4 of the English Limitation Act of 1623. ( Gaines v. City of New York, supra.) Simplified by the elimination of references to particular English forms of practice, section 355 provides: "If an action is commenced within the time prescribed therefor, and a judgment therein for the plaintiff be reversed on appeal, the plaintiff, or if he die and the cause of action survive, his representatives, may commence a new action within one year after the reversal." If construed literally as applying only in the event of reversals on appeal, section 355 would not give the protection that the English statute afforded to a plaintiff who had unsuccessfully pursued his right in a previous suit. Even the English statute, however, had to be supplemented by judicial construction and applied beyond its literal language to accomplish its purpose. "One may perhaps venture to say that the judges took rather a liberty with the statute, but I presume the origin of the doctrine is to be found in the hardship inflicted in particular cases on the litigant or his estate through no fault of his own by a rigid adherence to the terms of s. 4." (Lopes, L.J. in Swindell v. Bulkeley, 18 Q.B. 250; Hayward v. Kinsey, 12 Mod. 568, 88 Eng.Rep. 1526; Hodsen v. Harridge, 2 Wms.Saund. 64, 85 Eng.Rep. 693; Curlewis v. Mornington, 7 El.Bl. 285, 119 Eng.Rep. 1252; see Gaines v. City of New York, supra, at p. 537.)

The New York Court of Appeals in the Gaines case, speaking through Judge Cardozo, held that statutes that have their roots in the English statute should be construed with similar liberality: "We think that whatever verbal differences exist, the purpose and scope of the present statute are identical in substance with its prototype, the English Act of 1623. . . . The statute is designed to insure to the diligent suitor the right to a hearing in court till he reaches a judgment on the merits. Its broad and liberal purpose is not to be frittered away by any narrow construction. The important consideration is that by invoking judicial aid, a litigant gives timely notice to his adversary of a present purpose to maintain his rights before the courts." Although the Gaines case involved the section of the New York Code of Procedure that succeeded section 84 of that code from which section 355 of the California Code of Civil Procedure was taken, the doctrine of construction set forth therein did not rest on the wording of the new section but on the basic policy of the statute. The wording of section 355 is reminiscent of the old English statutes that specified situations instead of formulating general rules. As presently worded it protects a plaintiff who has mistaken his remedy if he was awarded a judgment in the first instance and defeated on appeal. There is all the more reason to protect a plaintiff, as in the present case, who has not mistaken his remedy but through error of the trial court was not allowed to proceed to trial. The basic policy that underlies section 355 calls for relief in such a case. (See Code Civ. Proc., § 4)

In any event this court is not powerless to formulate rules of procedure where justice demands it. Indeed, it has shown itself ready to adapt rules of procedure to serve the ends of justice where technical forfeitures would unjustifiably prevent a trial on the merits. ( Wennerholm v. Stanford University School of Medicine, 20 Cal.2d 713 [ 128 P.2d 522, 141 A.L.R. 1358]; Christin v. Superior Court, 9 Cal.2d 526 [ 71 P.2d 205, 112 A.L.R. 1153]; Tuller v. Superior Court, 215 Cal. 352 [ 10 P.2d 43]; see 31 Cal.L.Rev. 225, 227; see, also, Rogers v. Duhart, 97 Cal. 500, 504 [32 P. 570]; California Constitution, art. VI, § 4 1/2; Code Civ. Proc., §§ 355, 356, 473, 475; Civ. Code, §§ 3523, 3528.) The Wennerholm case, supra, is typical. The Legislature enacted section 472(c) of the Code of Civil Procedure to do away with the unduly technical rule that required plaintiff to request leave to amend, even though the trial court had already sustained a demurrer without leave to amend, before he could seek appellate review of the trial court's order. Although the action was pending at the time of the enactment, the court refused to follow the cases that had established the technical requirement, thus adopting the rule in 472(c) before it became law. It was also held that where amendment is sought after the statute of limitations has run, the amended complaint will be deemed filed as of the date of the original complaint so long as recovery is sought upon the same general set of facts (see, also, cases collected in 16 Cal.Jur., § 143, pp. 547-548), recognizing that despite the new filing, the action is still the same. [10] In the present case plaintiff brought his action on the policy in good time and diligently pursued it. The nonsuit was erroneous and unrelated to the merits. But for the unreasonable delay in bringing the action to trial, the limitation period would not have expired and ample time would have remained to file a new action. Since this action is in reality a continuance of the earlier action involving the same parties, facts, and cause of action, and was promptly filed after entry of judgment on the nonsuit, plaintiff should not be deprived of a trial on the merits because he failed to seek other remedies in the municipal court. [11] Statutes of limitations are not so rigid as they are sometimes regarded. Under certain circumstances property rights or immunities may be acquired as a result of the running of the statutory period, but the period will be extended or tolled by the occurrence of certain events, which may be the subject of conflicting evidence, such as absence from the state or disability. (Code Civ. Proc., § 351 et seq.) [12] It is established that the running of the statute of limitations may be suspended by causes not mentioned in the statute itself. ( Braun v. Sauerwein, 10 Wall. (77 U.S.) 218, 223 [19 L.Ed. 895]; Collins v. Woodworth, 109 F.2d 628, 629.) [13] It is settled in this state that fraudulent concealment by the defendant of the facts upon which a cause of action is based ( Kimball v. Pacific Gas Elec. Co., 220 Cal. 203 [ 30 P.2d 39]) or mistake as to the facts constituting the cause of action ( Davis etc. Co. v. Advance etc. Works, Inc., 38 Cal.App.2d 270 [ 100 P.2d 1067]; see 16 Cal.Jur. 505) will prevent the running of the period until discovery. [14] Principles of equity and justice, which moved this court in the Kimball case, supra, to grant relief are likewise controlling here. There is no need to make fine distinctions as to the persons who owe a duty to disclose. The Kimball case involved an employer whose fiduciary obligations to his employees were uncertain. The present case involves an insurer whose duty of good faith in dealing with the insured is well established. (See 13 Appleman, Insurance Law and Practice 37; Vance, Insurance (1930) 74.) It is likewise unnecessary to dwell upon the contention that the insurer's duty of good faith to its insured arises at the time of contracting and persists throughout the period when premiums are paid and no return is sought, but that when a loss occurs and the insured seeks to obtain the compensation provided in the contract, the parties deal at arm's length. It is sufficient to hold that the equitable considerations that justify relief in this case are applicable whether defendant violated a legal duty in failing to disclose its intention to set up this technical defense, or whether it is now merely seeking the aid of a court in sustaining a plea that would enable it to obtain an unconscionable advantage and enforce a forfeiture.

The judgment is reversed with directions to the trial court to overrule the demurrer.

Gibson, C.J., Shenk, J., and Carter, J., concurred.