Note 129 — Chapter I · TRANSITION PERIOD

In a work by Luigi Mazara (Temple antédiluvien découvert dans l'île de Calypso, Paris 1872) there are two engravings of gateways, one a subterranean one at Alatri in Latium, which is said to have been the work of Saturn, and is called the Porta Sanguinaria; the other of Cyclopean architecture was also in Latium, and called Porta Acuminata; both of them are pointed arches. This would carry the invention back to 2000 B.C. Many of the subterranean aqueducts of Rome have acute arches for purposes of strength.