Canal, an artificial cut in the ground, which is supplied with water from rivers, springs, etc. in order to make a navigable communication between different places. There are various circmstances, upon which the particular opt tions, necessary for con-igations, depend; and which consequently increase, or diminish, the labour and expence of execut-them: such as, the situation or' the ground ; the vicinity to, or connection with rivers ; the facility or difficulty with which the necessary quantity of water can be procured ; and many other requisites. The utility of canals to a trading nation are too well known ; we shall therefore only refer to the following, among the many works that have lately been published on this important subject, in which the structure, economy, and advantages of canals are amply and perspicuously treated, viz. 1.Mr. Fulton's "Treatise on Canal Navigation;'' 4to. 18s. Taylor, 1796- The author displays an ingenuous disposition, and a sincere wish to promote useful improvement. His work is well written the engraving beautifully executed, and the whole is replete with useful information. 2. Mr. Chapman's "Observations on the various systems of Canal Navigation;" 4to. 6s. Taylor. This performance also abounds with useful instruction, and forms a valuable and necessary addition to Mr. Fulton's work. 3. Mr. Tatham's "On the Political Economy of Inland Navigation, Irrigation, and Drain-age ;" 4to. ll. 5s. Faulder, 1799. This work likewise contains some valuable hints, and is not destitute of utility,

On the subject of clearing navigable canals of weeds, we shall under the head of Weeds.