how many feet of soil there were between us and the surface; and I told him that according to the last report it varied between eleven and two hundred and sixty feet.
"'Sometimes,' I said, 'the crust of earth is so thin that it is necessary to prolong the foundations of public buildings to the bottom of the Catacombs. Therefore in the course of our peregrinations there is a chance of our coming across the pillars of Saint-Sulpice, of Saint-Etienne-du-Mont, of the Panthéon, of the Val-de-Grâce, and of the Odéon. These buildings are, so to speak, raised on subterranean piles.'
"'Subterranean piles!' he cried joyfully. 'Is there really a chance that in the course of our peregrinations we shall come across subterranean piles?'
"Then he returned to his fixed idea:
"'And in the course of our peregrinations is there any chance of our coming across a way out? Are there many ways out of the Catacombs?' he said wistfully.
"'Plenty,' said I. 'In the first place, there are exits in the Quarter—"
"'So much the better!' he interrupted.
"'And others which are unknown, openings by which no one ever enters, but which none
