prevalent during his time. At the start of this treatise, Theilhaber introduces the concept of racial hygiene and sets up a discussion regarding the Jewish community in Berlin, noting a significant increase in their population due to migration from rural areas of Prussia and beyond. He presents initial statistics depicting the Jewish population growth while simultaneously establishing a worrying trend concerning declining birth rates among Jews in urban settings. Through a detailed analysis of demographic data, including birth rates and marriage patterns, he aims to substantiate his argument that socio-economic conditions, rather than inherent biological factors, have contributed to these changes in reproductive behavior within the Jewish community. (This is an automatically generated summary.)