The Powers which have recourse to arbitration sign a 'Compromis', in which the subject of the dispute is clearly defined, the time allowed for appointing Arbitrators, the form, order, and time in which the communication referred to in Article 63 must be made, and the amount of the sum which each party must deposit in advance to defray the expenses.

The 'Compromis' likewise defines, if there is occasion, the manner of appointing Arbitrators, any special powers which may eventually belong to the Tribunal, where it shall meet, the language it shall use, and the languages the employment of which shall be authorized before it, and, generally speaking, all the conditions on which the parties are agreed.