the aqueduct at various parts of its course show clearly enough. It
commences, as I have said, about a mile and a half from the present St.
Chamond, a town on the river Gier, about 16 miles from St. Etienne. Here
a dam appears to have been constructed across the bed of the river,
forming a lake from which the water entered the channel of the aqueduct,
which passed along underground until it came to a small stream which it
crossed by a bridge, long since destroyed.

After this it again became subterraneous for a time, and then crossed
another stream on a bridge of nine arches, the ruins of some of the
columns of which are still to be seen; and from these ruins it would
appear that the bridge had, at some time or another, been destroyed,
probably by the stream running under it having become torrential, and
subsequently rebuilt; again it became concealed underground, to reappear
in crossing a small valley and another small stream, when it was again
concealed by the ground, and in one or two places channels were even cut
for it through the solid rock, after which it reappeared on the surface
at a point where now stands the village of Terre-Noire, and where it was
necessary that it should somehow or another cross a broad and deep
valley. It ended in a stone reservoir, from which eight lead pipes
descending into the valley were carried across the stream at the bottom
on an aqueduct bridge, about 25 ft. wide, and supported by twelve or
thirteen arches, and then mounted the other side of the valley into
another reservoir, of which scarcely any remains are now seen, from which
the aqueduct started again, disappearing almost immediately under the
surface of the ground, to appear again from time to time crossing similar
valleys and streams upon bridges, the remains of some of which may still
be seen, until it reached Soucieu, on the edge of the valley of the
Garonne, where are still seen the remains of a splendid bridge, the
thirteenth on its course, nearly 1,600 ft. long, and attaining a height