On the morrow I departed after dinner, and passed by a vast ruin on the right-hand side of the road, which is by report six miles in extent. This was formerly a villa, and known as the _prædium_ of the Emperor Adrian.[130] The road from Tivoli to Rome crosses a rivulet impregnated with sulphur. The banks of the stream are all white therewith, and the stench may be smelt half a league away, but no medicinal use is made of the water. In this stream may be found divers little substances compounded of the scum of the water, which are so much like our medicinal powder that few could tell the difference, and the people of Tivoli make out of this same material all sorts of medicaments, two boxes of which I bought for seven sous and six deniers. In Tivoli are divers antiquities, two terminal images of a very ancient shape, and the remains of a temple with several columns still perfect, which legend declares to have been the temple of the ancient Sibyl. However, on the cornice thereof there may still be seen five or six large letters; but this inscription seems to have been left unfinished, for the stonework beyond them is still intact. Whether any other letters preceded these I know not, as on that side the wall is ruined. All that are now visible run as follows: Ce ... Ellius L. F. What may be their signification I cannot say. [Illustration: THE TEMPLE OF THE SIBYL AT TIVOLI _To face p. 174_, vol. ii. ] In the evening we arrived at Rome after a journey of fifteen miles. I travelled in a coach without any tedium or discomfort, a rare experience with me. The people here pay more careful heed to one particular usage than in any other place; that is to say, for the sake of health they find out the different characteristics of the various streets and quarters of the city, and even of the suites of apartments in their houses. This consideration is held to be of such high importance that they always change their residence according to the seasons. Even those who live in hired dwellings maintain at great cost three or four houses, so that they may shift at the proper season according to the advice of their physicians.