PORT ECONOMICS but as regards a wharf, it should be stressed that this is properly a structure for berthage purposes, flanking a riverside and only distinct from a quay, in that, as a rule, it is constructed of piles and framing instead of solid masonry or concrete. Quays are generally accepted as being substantially built river or sea walls, alongside which vessels may lie. Both wharves and quays are provided with adjacent space for receiving and loading goods. And here we may call attention to two statutory terms which it is desirable to define, in which the words quay and wharf are used in a legal, as distinct from an engineering, sense. “The terms are those of Legal Quays and Sufferance Wharves. From early times, British quays for the reception of goods have had to receive statutory sanction, and an Act of Queen Elizabeth nominated certain wharves or quays in existing seaports at which goods were to be landed and shipped. Subsequently, other quays have acquired the status of legal quays, either by special Act of Parliament, or by declaration of the Commissioners of the Treasury, under powers conferred upon them by the Customs Consolidation Act of 1876. A few quays have gained the title from immemorial usage. As distinct from these legally constituted quays, sufferance wharves are landing places on sufferance, i.e. places where certain classes of goods (for instance hemp, flax, coal, etc.) may be landed and shipped by special sufferance from the Crown or from the Commissioners of Customs and Excise. The following are the sections of the Customs Consolidation Act which relate to the matter— The Commissioners of the Treasury may, by their warrant, appoint any port, sub-port, haven or creek in the United Kingdom or in the Channel Islands, and declare the limits thereof, and appoint proper places within the same to be legal quays for the lading and unlading of goods, and declare the bounds and extent of any such quays, and annul the limits of any port, sub-port, haven or creek or legal quay already appointed to be hereafter set out and appointed, and declare the same to be no longer a port, 28