The Elements and their Inhabitants

Just as visible Nature is populated by an infinite number of living creatures, so, according to Paracelsus, the invisible, spiritual counterpart of visible Nature (composed of the tenuous principles of the visible elements) is inhabited by a host of peculiar beings, to whom he has given the name elementals, and which have later been termed the Nature spirits. Paracelsus divided these people of the elements into four distinct groups, which he called gnomes, undines, sylphs, and salamanders. ...