A sacrifice for rain. In times of drought, the Roman
matrons, clad in the stola, with bare feet and loosened hair, and the magistrates without
their purple robes and with reversed fasces, used to carry in procession a stone which
lay outside the Porta Capena near the Temple of Mars, through the city to the Capitol. The
name of the stone was lapis
, or petra manalis
Paul. ex Fest. p. 128), i.e. the stone from which water flows.