In this study, we examined specific agencements between the public and the private sectors based on the analysis of the Grant Institute, which, according to the study, is processed in branches in terms of direct funding, donations and inspection plan.With this, we intend to capture how the principle of mass school was accomplished in Brazil, one of the conditions to understand the genealogy of the "educator state."In this exercise, we focus attention on the settings between public and private, based on the experiences processed in Brazil's capital, through the years 1850 up to 1890.We organize our reflection considering the principle of freedom of education and its effects on the ordination of both primary and secondary school, public and private in the Imperial Court.Lastly, we bring into debate three mechanisms associated with the privatization of public resources.In face of this investment, we analyze the private school forms and supporting Impérios do privado: