Note 10 — Chapter IV · PART I. THE AQUEDUCTS.

“Incipit distribui [Aqua] Appia imo Publicii clivo ad portam Trigeminam.” (Ibid.)

And again: “Rivus Appiæ, sub Cœlio monte et Aventino actus, emergit, ut diximus, infra clivum Publicii.” (Ibid., c. 22.) The cave reservoir which formed the mouth of this stream, where it was distributed, has been found near the Marmorata, or marble-wharf. The Porta Trigemina was between that and the Salaria, or salt-wharf. Both of the wharves are still in use. Some good antiquaries consider that the Porta Trigemina consisted of three double gates, at intervals along the narrow strip of ground between the Aventine and the Tiber, and that the one of which remains have been found near the Sublician bridge was the middle one of the three: if so, this cave would be literally in the Porta Trigemina. In any case, it must have been close to it.