Note 22 — Chapter IV · PART I. THE AQUEDUCTS.
Reading edition
On the wall of the smaller reservoir, the fragment of an inscription, relating to the Thermæ of S. Helena, now in the Vatican Museum, is said to have been found:—
D. N. HELENA ... VEN. ... AVG. MAT. AVIA ... BEATIS ... THERMA ... SI ... ESTRV ...