Eromancy is one of six kinds of divination by means of air and water practiced by the Persians.

They enveloped their heads in a napkin and exposed to the air a vase filled with water, over which they muttered in a low voice the objects of their desire.

If the surface of the air showed bubbles, it was regarded as a positive prognostication.

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Divination for Beginners: Reading the Past, Present & Future -Scott Cunningham
Earth Divination: Earth Magic: Practical Guide to Geomancy - John Michael Greer