Note 43 — Chapter XI · THE HALOGENS: CHLORINE, BROMINE, IODINE, AND FLUORINE
George Kamensky translation
The euchlorine obtained by Davy by gently heating potassium chlorate with hydrochloric acid is (Pebal) a mixture of chlorine dioxide and free chlorine. The liquid and gaseous chlorine oxide (Note 35), which Millon considered to be Cl2O3, probably contains a mixture of ClO2 (vapour density 35), Cl2O3 (whose vapour density should be 59), and chlorine (vapour density 35·5), since its vapour density was determined to be about 40.