It might be about 3 P.M. when he reached the engirdling sewer, and he was at first amazed by the sudden widening. He unexpectedly found himself in a gallery whose two walk his outstretched arms did not reach, and under an arch which his head did not touch. The Great Sewer, in fact, is eight feet in width by seven high. At the point where the Montmartre drain joins the Great Sewer two other subterranean galleries, that of the Rue de Provence and that of the Abattoir, form cross-roads. Between these four ways a less sagacious man would have been undecided; but Jean Valjean selected the widest, that is to say, the engirdling sewer. But here the question came back again, "Should he ascend or descend?" He thought that the situation was pressing, and that he must at all risks now reach the Seine, in other words, descend, so he turned to the left. It was fortunate that he did so, for it would be an error to suppose that the engirdling sewer has two issues, one toward Bercy, the other toward Passy, and that it is, as its name indicates, the subterranean belt of Paris on the right bank. The Great Sewer, which is nought else, it must be borne in mind, than the old Menilmontant stream, leads, if you ascend it, to a blind alley, that is to say, to its old starting-point, a spring at the foot of the Menilmontant mound. It has no direct communication with the branch which collects the waters of Paris after leaving the Popincourt quarter, and which falls into the Seine by the Amelot sewer above the old isle of Louviers. This branch, which completes the collecting sewer, is separated from it under the Rue Menilmontant by masonry-work, which marks the point of the division of the waters into up-stream and down-stream. If Jean Valjean had remounted the gallery he would have arrived, exhausted by fatigue and dying, at a wall; he would have been lost.