Let the reader imagine Paris lifted off like a cover, the subterranean network of sewers, from a bird's-eye view, will outline on the banks a species of large branch grafted on the river. On the right bank, the belt sewer will form the trunk of this branch, the secondary ducts will form the branches, and those without exit the twigs.

This figure is but a summary one and half exact, the right angle, which is the customary angle of this species of subterranean ramifications, being very rare in vegetation.

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