a method of divination by water, practised by the ancients in this manner. They filled a cup or bowl of water: then fastening a ring to a piece of thread tied to their finger, held it over the water, and repeated a certain form of words, desiring to be satisfied with regard to their inquiry; and if the question was answered in the affirmative, the ring would strike the sides of the bowl of its own accord.

Another kind of hydromancy was to look upon the water in which the figure of several demons used to appear. This expedient Numa is said to have made use of, to settle the ceremonies of religion.

This way of divination is said to have been used first by the Persians, and afterwards approved by Pythagoras.