Much, however, as that treaty has done for the peace of the world, by assimilating in these respects the maritime law of nations, it has left many customs unchanged to challenge still the attention of reformers. It is therefore of some practical interest to consider of what nature future changes should be, inasmuch as, if we cannot agree to cease from fighting altogether, the next best thing we can do is to reduce the pretexts for it to as few as possible. The reservation, then, in favour of confiscating property that is contraband of war has left the right of visiting and searching neutral or hostile merchantmen for contraband untouched; though nothing has been a more fruitful source of quarrel than the want of a common definition of what constitutes contraband. Anything which, without further manipulation, adds directly to an enemy’s power, as weapons of war, are contraband by universal admission; but whether corn and provisions are, as some text-writers assert and others deny; whether coined money, horses, or saddles are, as was decided in 1863 between the Northern Powers of Europe; whether tar and pitch for ships are, as was disputed between England and Sweden for 200 years; whether coal should be, as Prince Bismarck claimed against England in 1870; or whether rice is a war-threatening point of difference between England and France in this very year of grace; these are questions that remain absolutely undecided, or are left to the treaties between the several Powers or the arbitrary caprice of belligerents. The Declaration of Paris was equally silent as to the right (demanded by all the Powers save England) for ships of war, which have always been exempt from search, to exempt from search also the merchant vessels sailing under their convoy. So fundamental a divergence between the maritime usages of different countries can only be sustained under the peril of incurring hostility and war, without any corresponding advantage in compensation.