(29) Isis holds in her right hand a small sailing ship with the spindle of a spinning wheel for its mast. From the top of the mast projects a water jug, its handle shaped like a serpent swelled with venom. This indicates that Isis steers the bark of life, full of troubles and miseries, on the stormy ocean of Time. The spindle symbolizes the fact that she spins and cuts the thread of Life. These emblems further signify that Isis abounds in humidity, by means of which she nourishes all natural bodies, preserving them from the heat of the sun by humidifying them with nutritious moisture from the atmosphere. Moisture supports vegetation, but this subtle humidity (life ether) is always more or less infected by some venom proceeding from corruption or decay. It must be purified by being brought into contact with the invisible cleansing fire of Nature. This fire digests, perfects, and revitalizes this substance, in order that the humidity may become a universal medicine to heal and renew all the bodies in Nature.