the lower court the defendants met the issue head-on, that is, whether or not the increase in taxes and insurance was within the contemplation of the parties when the contract was signed. Thus, the defendants tried the case in the lower court on the theory that the written agreement was ambiguous and required parol evidence to clarify its meaning on the matter in controversy.
The defendants, appellants herein, cannot now be heard to complain that the parol evidence received, without objection, varied a written contract. This court said in Shanks v. Williams, 93 Kan. 573, 144 Pac. 1007:
“When the parties to an action have mutually adopted a theory and fully tried their controversy in accordance therewith this court will not on appeal adopt another theory and decide the case in accordance therewith, but will affirm or reverse according as the lack or presence of error shown by the record may require, upon the theory adopted by the parties.”
In the recent case of Demaras v. Smith, 176 Kan. 416, 271 P. 2d 764, one of the errors urged on appeal was that the trial court erred in the reception of secondary evidence without proper foundation being laid. It was there noted that no objection was made to the evidence on the appropriate ground and it was held that such an objection came too late when first made on appellate review.
Analogous situations have been decided by this court in cases where a change in theory was presented on appellate review, and these cases held that it was too late to change the theory on appeal. (See Julian v. Oil Co., 83 Kan. 127, 131, 109 Pac. 996; Kolterman v. Atkinson, 151 Kan. 623, 629, 100 P. 2d 729; Dewey v. Bobbitt, 84 Kan. 663, 664, 114 Pac. 865; Meyer Sanitary Milk Co. v. Casualty Reciprocal Exchange, 145 Kan. 501, 66 P. 2d 619; Fidler v. Short, 118 Kan. 37, 39, 233 Pac. 1022; Enterprise v. Smith, 62 Kan. 815, 821, 62 Pac. 324; and L. N. & S. Rly. Co. v. Curtan, 51 Kan. 432, 437, 33 Pac. 297.)
Under title circumstances we are now obligated to review this case on the premise that the written contract was ambiguous, since the parties so considered it.
Since the case was tried in the lower court on the theory that the written contract was ambiguous, the trial court was justified in utilizing all possible aids to discover a fair and equitable solution. It is only natural that the parties to a contract know best what was meant by its terms and are the least liable to be mistaken as to the intention of the contract. Where the contract is silent or ambiguous