The actual wishes of the population in the ceded districts had not been expressed, so it was provided in the treaty that during the six months after its coming into force the Belgian authorities should open registers in which the inhabitants might record a desire to have any part of the ceded territory remain under German sovereignty, the results to be passed upon by the League of Nations. It would have been more consistent with the rest of the treaty if the League had also been entrusted with securing the original expression of opinion. The territory transferred by the treaty comprised 376 square miles with a population of 61,000, constituting the Kreise of Malmedy and Eupen, whose administrative limits were preserved in order to interfere as little as possible with local conditions.[11] The treaty also settled an old controversy in this region respecting the district of Moresnet, disputed between Belgium (until 1839 Holland) and Prussia since 1815, when two inconsistent boundary lines of the treaty of Vienna left in doubt the sovereignty over a triangular area of about 900 acres which contained the valuable zinc mine of Vieille Montagne. Neither side would yield, and a convention of 1816 which provided for the neutralization of the area under a _condominium_ or joint administration lasted until the war. With the exhaustion of the mine the district has declined in importance, but the anomaly needed clearing up, as the Germans had frequently declared. The treaty assigns the disputed territory to Belgium, and adds a square mile or so in Prussian Moresnet, comprising the domanial and communal woods.[12] Far more important for Belgium was the question of her relations with another eastern neighbor, the duchy of Luxemburg. An integral part of the southern Netherlands until the French Revolution, Luxemburg had in 1815 been made into a grand duchy and handed over to the king of Holland. It revolted with Belgium in 1830 and sent members to the Belgian Parliament, but on the final separation of Belgium and Holland in 1839 it was divided, the western or Walloon portion going to Belgium, and the eastern or German-speaking portion continuing as the grand duchy. The dynastic union with Holland came to an end in 1890, when a divergence in the laws of succession established a separate line of grand dukes.