On distillation by manure original: "au fiens"

A hand-colored technical illustration shows a distillation apparatus using heat generated by fermenting manure. It features a large wooden rectangular trough or box filled with a yellowish substance, likely manure. Ten green glass vessels, such as cucurbits or retorts, are partially buried in the substance in two rows of five. A central metal pipe with small holes runs the length of the trough. To the left, a larger brown ceramic vessel sits on a three-legged stool, connected to the trough's internal piping by a curved neck. The entire trough is supported by a wooden bench or trestle.