Collect on delivery. These letters are not cabalistic, but have a determinate meaning. They import the carrier’s liability to return to the consignor either the goods or the charges. U. S. Exp. Co. v. Keefer. 59 Ind. 267; Fleming v. Com., 130 Pa. 138, 18 Atl. 622; Express Co. v. Wolf, 79 111. 434.