§ 13. It is, therefore, necessary for such conflicting States as intend to have the conflict determined by arbitration to conclude a treaty by which they agree to this course. Such treaty of arbitration involves the obligation of both parties to submit in good faith to the decision of the arbitrators. Frequently a treaty of arbitration will be concluded after the outbreak of a difference, but it also frequently happens that States concluding treaties stipulate therein by the so-called Compromise Clause,[12] that any difference arising between the parties respecting matters regulated by such treaty shall be determined by arbitration. Two or more States can also conclude a so-called general treaty of arbitration, or treaty of permanent arbitration, stipulating that all or certain kinds of differences in future arising between them shall be settled by this method. Thus article 7 of the Commercial Treaty between Holland and Portugal[13] of July 5, 1894, contains such a general treaty of arbitration, as it stipulates arbitration not only for differences respecting matters of commerce, but for all kinds of differences arising in the future between the parties, provided these differences do not concern their independence or autonomy. Until the Hague Peace Conference of 1899, however, general treaties of arbitration were not numerous. But public opinion everywhere was aroused in favour of general arbitration treaties through the success of this conference, with the result that from 1900 to the present day many general arbitration treaties have been concluded.[14] [Footnote 12: See above, § 3.] [Footnote 13: See Martens, _N.R.G._ 2nd Ser. XXII. p. 590.] [Footnote 14: See below, § 17.] [Sidenote: Who is to arbitrate?]