Abstract

By the end of the 19th century, the Prussian censuses registered regularly the nationality of the population according to a standard criterion: the mother tongue. The background to this institutionalization could be mapped out in terms of the early creation of the statistical office, the reform of the bureaucracy, and the political challenge following the annexation of the western part of the former Polish state. However, this paper gives a different account of that goes beyond a state-level history of a statistical institution. At the beginning of the 19th century, nationality was already registered in some localities. The purpose was to measure the use of German in schools and churches and hence the effectiveness of the Germanization of the Poles. Although the statistical office was in existence, it had little influence on these local practices, and their heterogeneity prevailed for decades. This situation was modified by the centralization of the census in the 1860s in the hands of the statistical office, and the emergence of a demographic approach. This change occurred in the context of discussions with local authorities regarding their use of language statistics. The census has to be seen therefore as an integration on multiple levels of statistical practices.