Chapter 2 establishes the context usually neglected by histories of agricultural literature: how farming was learned without books in the prevailing system of knowledge in the sixteenth and seventeenth centuries. It examines the discourse on the ‘mystery of husbandry’ (and closely associated discourse of ‘secrets’), a term denoting the knowledge and skills acquired by experienced practitioners that were inaccessible to amateurs, to both elucidate contemporary beliefs about learning through labour and to indicate the ways in which the publication of husbandry manuals disrupted existing notions of expertise. In doing so, it explores the parallels between craft and farming knowledge and borrows ideas from modern studies to argue that early modern husbandmen and housewives would have possessed a ‘peasant epistemology’ analogous to an ‘artisanal epistemology’. The chapter argues that when linked to broader socio-economic changes in farming, the emergence of the term ‘mystery of husbandry’ in the seventeenth century can be seen as a symptom of tectonic shifts in the social system of agricultural knowledge. In short, the knowledge of husbandry was being commodified in an increasingly competitive commercial environment.