Independent sources in Europe between 1878 and 1918 generally tended to view the Slavic population of Macedonia in two ways: as Bulgarians and as Macedonian Slavs. German scholar Gustav Weigand was one of the most prominent representatives of the first trend with the books "Ethnography of Macedonia" (1924, written 1919) and partially with "The Aromanians" (1905). The author described all ethnic groups living in Macedonia, showed empirically the close connection between the western Bulgarian dialects and the Macedonian dialects and defined the latter as Bulgarian. The International Commission constituted by the Carnegie Endowment for International Peace in 1913 to inquire into causes and conduct of the Balkan Wars also talked about the Slavs of Macedonia as about Bulgarians in its report published in 1914. The commission had eight members from Great Britain, France, Austria-Hungary, Germany, Russia and the United States.