If the purpose of this volume is to tease out the forms of ecology present in early modern France, then it seems we have our work cut out for us. First, what do we mean by ‘ecology’? Second, how does one even begin to look for this ecology in an era far removed from our own, where the concept risks anachronism? Timothy Morton modelled a possible means of addressing these challenges in his 2010 book, The Ecological Thought. Morton's title refers to a perspective on the natural world that he advocates in the book, and which I will adopt for the purposes of this essay. It is not unusual for Morton to use early modern texts to explain his theories. For example, he uses John Milton's Paradise Lost (1667), a work that draws deeply on Renaissance sources, to illustrate the ecological thought. I wish to extend Morton's technique to one of Milton's primary inspirations and one of the most popular authors of the late sixteenth century, the French Protestant Guillaume du Bartas (1544–1590). In the following chapter, I will show how Du Bartas arrives at this ecological point of view in a different way from Milton. Whereas Milton employs a perspective that zooms outward from Earth, Du Bartas zooms inward, into the human body, in order to offer up a differently inflected view of the ecological thought.