In this article, I discuss two roles of documents in the creation and enforcement of public health laws in early colonial Vanuatu and their implication in colonial attempts to transform ni-Vanuatu societies and subjectivities. Colonial officials of the British-French Condominium based their projects on their admittedly partial knowledge in reports generated by experts studying depopulation. This knowledge, I argue, produced a ‘population’ by categorizing people according to their relationship with a reified notion of culture. The Condominium enforced health laws by sending letters to people categorized as Christian who would, the Condominium hoped, adhere to the regulations as self governing subjects. Officials would engage in persuasive conversations when they enforced the regulations in ‘bush’ villages. I conclude by reflecting on ni- Vanuatu knowledge of well-being and illness that could not be represented or documented and its centrality for subjectivities that might elude, if not subvert, the modern subject presumed by colonial strategies of governance.