A detailed, itemized and verified account of all moneys so expended by the city shall be presented to the board of county commissioners of the county in which such city is located, and said board of county commissioners shall monthly audit claims therefor, and when it shall determine that the items of expense were incurred under the provisions of Kan. Stat. Ann. § 65-301, shall allow such claims and draw warrants on the county treasurer in favor of said city therefor, and it shall be the duty of the county treasurer of said county to pay the same out of any funds in the treasury not otherwise appropriated.