In several different parts of Europe the ton or lock-duty upon a canal is the property of private persons, whose private interest obliges them to keep up the canal.

If it is not kept in tolerable order, the navigation necessarily ceases altogether, and along with it the whole profit which they can make by the tolls. If those tolls were put under the management of commissioners, who had themselves no interest in them, they might be less attentive to the maintenance of the works which produced them. The canal of Languedoc cost the King of France and the province upwards of thirteen millions of livres, which (at twenty-eight livres the mark of silver, the value of French money in the end of the last century) amounted to upwards of nine hundred thousand pounds sterling. When that great work was finished, the most