Civil Code, Art. 1508

A negotiable document of title may be negotiated by delivery: (1) Where by the terms of the document the carrier, warehouseman or other bailee issuing the same undertakes to deliver the goods to the bearer; or (2) Where by the terms of the document the carrier, warehouseman or other bailee issuing the same undertakes to deliver the goods to the order of a specified person, and such person or a subsequent indorsee of the document has indorsed it in blank or to the bearer. Where by the terms of a negotiable document of title the goods are deliverable to bearer or where a negotiable document of title has been indorsed in blank or to bearer, any holder may indorse the same to himself or to any specified person, and in such case the document shall thereafter be negotiated only by the indorsement of such indorsee. (n)