¶1*641The opinion of the'court was delivered by
¶2The action is assumpsit and the plaintiff seeks to recover for services in sawing lumber, drawing slabs, and for damages sustained by him by reason of the defendant’s failure to furnish slabs pursuant to his agreement. These items are all provided for in a written contract under seal and from the facts reported by the referee, we cannot say as a matter of law that the sealed instrument has been changed or modified.
¶3By the sealed instrument the plaintiff was required to saw the lumber in question, the price to be paid therefor by the defendant and time of payment being provided for therein.
¶4Each party was to pay one-half of the expense of drawing away the slabs and the defendant was to furnish the plaintiff with slabs for use in his engine. The referee has found ■that the sawing tvas done under this contract; that the defendant, under the contract, should pay one-half of the expense of getting the slabs away from the mill; and that the ■defendant failed to furnish the slabs stipulated in the contract. From these findings, it is clear that the parties have acted under the sealed contract, and that there has been no modification of it. There having been no subsequent parol modification of the contract, and the plaintiff having performed the service under the contract in reliance upon it, and the omission of the defendant being an omission to perform and keep the covenants contained in the sealed instrument, the action of assumpsit cannot be sustained. The plaintiff has a remedy by an action of covenant upon the sealed contract, and having this remedy he cannot waive it and bring assumpsit. Myrick v. Slason, 19 Vt. 121; Camp v. Barker, 21 Vt. 469; King, Fuller & Co. v. Lamoille Valley R. R. Co., 51 Vt. 369; Wood et al. v. Edwards et al., 19 Johns. 205; Codman v. Jenkins, 14 Mass. 93. In Myrick v. Slason, supra,it is held that when a party has a *642remedy by an action of covenant on a contract under seal, he is precluded from suing in assumpsit.'
¶5[This cause was referred by the agreement of the parties, and it is claimed by the plaintiff that by the agreement to refer the cause the defendant has waived all questions of variance and objections which he might have made to the form of the action, and that judgment should be rendered on the report, the court allowing him, if necessary, to amend by changing the form of action. It is only legally amendable defects in a declaration that a reference cures. Sumner v. Brown, 34 Vt. 194. The defect in the declaration in this case is in the form of the action; the action should have been covenant on the sealed instrument. An amendment that changes the form of action from assumpsit to covenant is not allowable. Saville, Somes & Co. v. Welch, 58 Vt. 683 ; Watermans. R. R. Co., 30 Vt. 610.]
¶6The -pro forma judgment is reversed and jjflgment rendered for the defendant to recover his costs.'..