European ethnographs and linguists until the Congress of Berlin usually regarded the language of the Slavic population of Macedonia as Bulgarian. French scholars Ami Boué in 1840 and Guillaume Lejean in 1861, Germans August Grisebach in 1841, J. Hahn in 1858 and 1863, August Heinrich Petermann in 1869 and Heinrich Kiepert in 1876, Slovak Pavel Jozef Safarik in 1842 and the Czechs Karel Jaromír Erben in 1868 and F. Brodaska in 1869, Englishmen James Wyld in 1877 and Georgina Muir Mackenzie and Adeline Paulina Irby in 1863, Serbians Davidovitch in 1848, Constant Desjardins in 1853 and Stefan I. Verković in 1860, Russians Viktor I. Grigorovič in 1848 Vinkenty Makushev and M.F. Mirkovitch in 1867, as well as Austrian Karl Sax in 1878 published ethnography or linguistic books, or travel notes, which defined the Slavic population of Macedonia as Bulgarian. Austrian doctor Josef Müller published travel notes in 1844 in which he regarded the Slavic population of Macedonia as Serbian. The region was further identified as predominantly Greek by French F. Bianconi in 1877 and by Englishman Edward Stanford in 1877. He maintained that the urban population of Macedonia was entirely Greek, whereas the peasantry was of mixed, Bulgarian-Greek origin and had Greek consciousness but had not yet mastered the Greek language.