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Nobody knew the (correct) cycle of water until the 17th century, when it was first calculated that precipitations alone were more than sufficient to account for the water flow of the river Seine.

Plato and other Greek philosophers believed that springs and rivers originated from purified sea water transported underground. Aristotle improved the theory by suggesting vapor transport through caverns from the sea and condensation at springs.

In the VM spirits of the air (known as sylphs after Paracelse) transport the heavenly water through tubes until it ends up in rivers or in the atmosphere as rain, snow or hail, depicted exiting the tubes on You are not allowed to view links. Register or Login to view. .