The 'triumph of the anti-phlogistians' is a familiar story to the historians and philosophers of science who characterize the Chemical Revolution as a broad conceptual shift. The apparent ''incommensurability'' of the paradigms across the revolutionary divide has caused much anxiety. Chemists could identify phlogiston and oxygen, however, only with different sets of instrumental practices, theoretical schemes, and philosophical commitments. In addition, the substantive counterpart to phlogiston in the new chemistry was not oxygen, but caloric. By focusing on the changing visions of chemical body across the revolutionary divide with a more sensitive probe into the historical actors' material manipulations and linguistic usage, we can historicize their laboratory realities and philosophical agenda. An archeology of chemical bodies that configures the fragile stability of the material worlds chemists created in succession promises a philosophical horizon that would recognize our hybrid (natural-artificial) environment as an evolving investigative object of science.Keywords Phlogiston Á Caloric Á Chemical ontologies Á Incommensurability Á Lavoisier Á Guyton de MorveauThe Chemical Revolution has enjoyed a privileged status in the historiography of the European sciences. Building on the nineteenth-century cult of Lavoisier (Kim 2005), historians scrutinized his self-conscious reformulation of chemical theory already in the 1930s, well before the history of science became established as a professional discipline. In these stories that amplified the nineteenth-century myth of Lavoisier's revolutionary ideas and methods, phlogiston was a 'hypothetical' substance that eluded detection, yet was held responsible for several genres of chemical actions such as combustion, calcination, and acidification. The anomaly in the weight consideration-that the release of phlogiston from a substance (e.g. lead) produced a heavier substance (e.g. lead oxide)-supposedly revealed the absurdity of the phlogiston theory ''based on an unsound and insecure