&ldquo;Essay on the Cause of Chemical Proportions, and on some Circumstances Relating to them: together with a short and easy way of expressing them&rdquo; in Annals of Philosophy, or Magazine of Chemistry, Mineralogy, Mechanics, Natural History, Agriculture and the Arts 3 (III), pp. 443&ndash;454, 1813 and 3 pp. 51&ndash;62, 93&ndash;106, 244&ndash;255, 353&ndash;364, 1814 WITH &ldquo;Experiments on the Nature of Azote, of Hydrogen, and of Ammonia, and upon the Degrees of Oxidation of which Azote is susceptible&rdquo; in Annals of Philosophy, or Magazine of Chemistry, Mineralogy, Mechanics, Natural History, Agriculture and the Arts 2 (II), pp. 276&ndash;284 and 357&ndash;368, 1813. J&ouml;ns Jacob Berzelius, Jons Jacob.