An address to the Right Honble the lord-mayor, the worshipful the aldermen, and Common-Council, of the city of London, on the importance and great utility of canals in general : the advantages which may fairly be expected from the canal now proposed to be made from Waltham-Abbey ; and the necessity of promoting, near the metropolis, such improvements as are now carrying on in the more distant parts of this kingdom, as being the true means of preserving to the port of London, that superiority in foreign as well as country trade, which it has hitherto enjoyed /