(c) The settlement of disputes or of questions liable to give rise to disputes by conferences and congresses is common, and implies a meeting of representatives of the interested parties for consideration of the terms of agreement upon which a question may be adjudicated. In general the conclusions of a congress are more formal and are regarded as having more binding force than those of a conference, though this distinction is not always made. States not directly interested may participate in conferences or congresses, and sometimes as mediators play a leading part.
(d) Arbitration involves an agreement between the disputants to submit their differences to some person or persons by whose decision they will abide. Arbitration has been common from early times. It is now becoming common to insert in treaties clauses providing for arbitration in cases of disagreement upon the interpretation of clauses of the treaty, and to resort more and more to this method of settling disputed international questions.
The parties submitting the question to arbitration usually provide for the naming of the arbitrator or arbitrators, and for the rules and principles in accord with which the decision shall be made.
It is generally admitted that a decision is not binding if it is not in accord with the principles to which the disputants had agreed; if it is flagrantly unjust; if it is equivocal and itself open to dispute; or if the decision is obtained by fraud or force.
Of about thirty cases of arbitration during the nineteenth century, the decision in one case was rejected by both parties to the dispute, and in one case rejected by one of the parties. In several other instances one party has refused to submit to arbitration questions readily lending themselves to such settlement, even though requested by the other party.[283]
[§ 89. Non-hostile Redress]
Good offices, mediation, and arbitration can only extend to international differences of certain kinds. Such measures are not applicable to all cases of disagreement, nor are such measures always acceptable to both parties. Consequently certain other practices have arisen with the view of obtaining satisfaction by measures short of war. Formerly an individual might be commissioned by a letter of marque and reprisal to obtain satisfaction from a state for injuries which he had suffered. This practice is, however, discontinued,[284] and satisfaction must be obtained through the proper state channels. The means by which satisfaction may be claimed vary, and are usually classed as retorsions, reprisals, of which embargo is an important variety, and pacific blockades.
[§ 90. Retorsion]
Retorsion is a species of retaliation in kind.[285] Retorsion may not consist in acts precisely identical with those which have given offense, though it is held that the acts should be analogous. The offense in consequence of which measures of retorsion are taken may be an act entirely legitimate and desirable from the point of view of the offending state. Another state may, however, consider the act as discourteous, injurious, discriminating, or unduly severe. In recent years commercial retorsion has become a very important means of retaliation which, bearing heavily upon modern communities, may lead to a speedy settlement of difficulties. The tariff wars of recent years show the effectiveness of commercial retorsion, e.g. the measures in consequence of the tariff disagreements between France and Switzerland in 1892. These measures of retorsion should always be within the bounds of municipal and international law.