Within the human being Sulphur -Fire – (located in stomach and sexual parts) represents the will forces, Salt – Water – the thinking forces, and Mercury the heart forces or the emotional life of man. A union of three is a well-balanced, moral man. Mercury is a mediator balancing Sulphur and Salt.
The symbols of the four elements: Air as a chameleon (in medieval times it was believed that the chameleon ate only air) or the form of a bird; Fire as a salamander; Water as a fish, sometimes as water flowing in a stream or from a water jug; Earth as a squirrel. Spirit and soul were often visualized as linked with Water, while the body was associated with Earth.
Seven metals in Alchemy: gold, silver, mercury, copper, iron, tin and lead. Each of these was linked to a particular planet: gold – Sun; silver – Moon; mercury – Mercury; copper – Venus; iron – Mars; tin – Jupiter; lead – Saturn. Seven days of the week were also associated with the planets and metals. It was believed that the planets and metals existed inside every human being. The balance between these made up the human temperament, personality and even physical appearance. It was believed that there are seven different types of person, linked with the seven planets or metals.