3The public notice of the intention to let an allotment out of land when set apart shall specify the amount of land to be let, and the rent per acre or rod to be paid, and the place and time at which applications are to be made, and shall be given annually in the month of June, or in such other month as may be fixed by, or in pursuance of, rules under this Act:. Provided that in any year in which there will be no allotment vacant out of land already set apart, it shall not be necessary to give such notice.