Unpublished paper, 'Principium id, quem etherem, spiritum; ignem aereum, in corpore vero vaporem expansilem animalem, principium animale aut vitale mechanicum nominamus, quotuplici statu in corpore et sanguine dominetur' [That principle, which is ether, spirit; air fire, but in the body we call the expansive animal vapor, the animal or mechanical vital principle, which dominates the multifold state in the body and the blood] by unknown author The author discusses the movement and effect of air and expansive vapours within the blood and the body overall in animals and humans. The author provides a series of hypotheses and arguments on this topic in succession. Subject: Physiology [early 19th century]