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 tiff being a bona fide purchaser for value; citing Comrs. v. January, 94 U. S. 202; Kenicott v. Supervisors, 16 Wall. 452; and other cases.

Messrs. E. J. & J. P. McMahon and J. E. Robinson, for respondent, maintained that the warrants not being negotiable, the doctrine of estoppel does not apply; citing School Dist. v. Stough. 4 Neb. 357; 13 Gray, 318; and 56 Me. 315.

, C. J. The judgment in favor of the defendant must be affirmed. The action was upon three school township warrants, issued by the officers of the defendant. These warrants are void. They were issued to pay for the services of a teacher who held no lawful certificate of qualification. No such person can be employed to teach. The statute so declares, and any contract made in violation of this provision is void by the express terms of the same act. § 1723, Comp. Laws. There was therefore no consideration for these warrants. The teacher had no claim against the defendant, because the statute declares she should not be employed to teach, and every act in violation of this provision was a nullity, so far as the liability of the defendant is concerned. The plaintiff cannot claim protection as an innocent purchaser for value. That such instruments are not negotiable in the sense that their negotiation will cut off defenses is the voice of all the decisions. Wall v. Monroe Co., 103 U. S. 74; Mayor v. Ray, 19 Wall. 468; 1 Dill. Mun. Corp. (3d Ed.) § 503; Miner v. Vedder, (Mich.) 33 N. W. Rep. 47. The purchaser buys at his peril. Nor is the doctrine of estoppel applicable. Could town officers in this manner estop a municipal corporation, void acts—acts void because expressly forbidden by the sovereign—would have validity, and the will of the legislature would be nullified by the conduct or statement of mere municipal agents. The cases cited on this point have no bearing on this question. No decision can be found holding that a void warrant receives life from the false statement of such an agent, under the circumstances existing in this case. Unless we were willing to leave such corporations to the mercy of dishonest agents, we would not follow such a case could one be found. If an agent can estop the township by a false statement that the teacher has received the certificate, he can estop it also by a