The Toleure, a tributary of the Aubonne, frequently large enough
to be called a confluent, flows out from the foot of a wall of rock
composed of regular parallelopipeds, and in the spring, when the snows
are melting freely, its sources burst out at various levels of the
rock. Farther to the west, the Versoie, famous for its trout, pours
forth a full-sized stream near the Chateau of Divonne, which is said
to take its name (_Divorum unda_) from this phenomenon. Passing to the
northern slope of this range of the Jura, the Orbe is a remarkable
example of the same sort of thing, flowing out peacefully in very
considerable bulk from an arch at the bottom of a perpendicular rock
of great height. This river no doubt owes its origin to the
superfluous waters of the Lake of Brenets, which have no visible
outlet, and sink into fissures and _entonnoirs_ in the rock at the
edge of the lake. Notwithstanding that the lake is three-quarters of a
league distant, horizontally, and nearly 700 feet higher, the belief
had always been that it was the source of the stream, and in 1776 this
was proved to be the fact.
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