In all controversies concerning property, and in all suits between two or more persons, except in cases in which it has heretofore been otherways used and practiced, the parties have a right to a trial by jury; and this method of procedure shall be held sacred, unless, in causes arising on the high seas, and such as relate to mariners' wages, the legislature shall hereafter find it necessary to alter it. [See Amendments, Art. XLVIII, The Initiative, II, sec. 2].