 In other sources, the mares are driven into their man-killing frenzy by consuming either an herb in their Boeotian pasture at Potniae or water from a toxic well.Gilbert Murray saw Hippolytus, Glaucus and their ilk as undergoing "sparagmos" as vegetation deities.In the "Georgics", Vergil casts the neglect of Venus as preventing the mares from mating.