These latter problems are the province of criminal anthropology and criminal sociology, sciences so called because they view crime as the outcome of anthropological and social conditions.
At the meeting of the Naturforscherversammlung at Innsbruck in 1869, he was one of the founders of the German Anthropological Society, of which he became president in the following year; and from 1869 onwards he presided over the Berlin Anthropological Society, also acting as editor of its proceedings in the Zeitschrift fiir Ethnologic. In ethnology he published a volume of essays on the physical anthropology of the Germans, with special reference to the Frisians; and at his instance a census, which yielded remarkable results, was carried out among school children throughout Germany, to determine the relative distribution of blondes and brunettes.
An examination of their language seems to indicate that, it belongs to the Mon-Khmer group of languages, and the anthropological information forthcoming concerning the Sakai points to the conclusion that they show a greater affinity to the people of the Mon-Khmer races than to the Malayan stock.
De Lapparent and Elisee Reclus - has his individual point of view, one devoting more attention to the results of geological processes, another to anthropological conditions, and the rest viewing the subject in various blendings of the extreme lights.
Still, craniological researches show that, notwithstanding this fact, the Slav type has been maintained with remarkable persistency: Slav skulls ten and thirteen centuries old exhibit the same anthropological features as those which characterize the Sla y s of our own day.