ABSTRACT A division in scholarship on Rousseau’s Second Discourse turns on the issue of division itself. Some see Rousseau’s natural man collapsing the division between man and beast through suggesting that our origins might be in orangutans, while others see Rousseau depicting a rupture of the human being from the rest of the animal kingdom through the separation of the physical and the metaphysical. I argue that in looking to the natural scientific culture of Rousseau’s own time, one can see (...) that he is employing a uniquely informed vision of the human being that itself straddles this divide of interpretation through presenting man as both a naturally and mythically hybrid creature. To conclude, I claim that illuminating this hybrid identity of the human being also sheds new light on the kind of narrative Rousseau employs. His ‘hypothetical history’ is itself a hybrid of two distinct origin stories, mirroring the very argument Rousseau is making: that man is always a duplex of the animal and the spiritual. This moves beyond presenting Rousseau as a thinker of irresolvable paradoxes to seeing the Second Discourse as a resolved presentation of what it means to be a natural duplex. (shrink)