handling of moneys.] The board of trustees of every such corporation shall hold four meetings in each year on the first Saturdays in the months of January, April, July and October for the transaction of all business of the corporation, of which meetings all persons shall be required to take notice. The corporation shall not be bound by any sale, mortgage, conveyance, lease or other disposition of its common property, or any part thereof, unless the same be made and executed in pursuance of a resolution of such board adopted by the affirmative vote of two-thirds of the members present at any of the regular meetings provided for by this section, and duly entered upon the record of such meeting and attested by the president of said board. The board of trustees may determine the method and advisability of disbursing, investing or handling moneys that come into their hands from the sales and revenues of the grant, and shall fix and determine the nature, amount and costs of improvements they may deem necessary to be made upon the grant by vote of two-thirds of the members present at any meeting. All contracts and vouchers for the payment of money must be signed by the president, and no payment or contract shall be made or effected unless the same be directed by two-thirds majority of the members present at any meeting.