Now the tsar of Muscovy and of all Russia adopted the airs and methods of a Tatar khan and surrounded himself with the pomp and splendours of a Byzantine emperor.
He also began his researches into "different kinds of airs," getting a plentiful supply of "fixed air" from a brewery next door to his house.
He also showed that on heating mercury calx alone an " air " was liberated which differed from other " airs," and was slightly heavier than ordinary air; moreover, the weight of the " air " set free from a given weight of the calx was equal to the weight taken up in forming the calx from mercury, and if the calx be heated with charcoal, the metal was recovered and a gas named " fixed air," the modern carbon dioxide, was formed.
His treatise IIEpi a pwv, uBaTwv, Kai T07rwv (Airs, Waters, and Places) contains the first enunciation of the principles of public health.
Littre accepts the following thirteen as absolutely genuine: (I) On Ancient Medicine (IIEpi ap X airs i f rpLK'Y / s); (2) The Prognostics (IIpoyvcovruK6v); (3) The Aphorisms ('AOopc-pot); (4) The Epidemics, i.