long, drizzling showers. Sometimes the weight of the surrounding houses on a marly or sandy soil forced out the vaults of the subterranean galleries and caused them to bend aside, or it chanced that a flooring vault burst and split under this crushing thrust.
In this manner, the heaping up of the Parthenon, obliterated, a century ago, a portion of the vaults of Saint-Genevieve hill.
When a sewer was broken in under the pressure of the houses, the mischief was sometimes betrayed in the street above by a sort of space, like the teeth of a saw, between the paving-stones; this crevice was developed in an undulating line throughout the entire length of the cracked vault, and then, the evil being visible, the remedy could be promptly applied. It also frequently happened, that the interior ravages were not revealed by any external scar, and in that case, woe to the sewermen. When they entered without precaution into the sewer, they were liable to be lost.
Ancient registers make mention of several scavengers who were buried in fontis in this manner.
They give many names; among others, that of the sewerman who was swallowed up in a quagmire under the man-hole of the Rue Careme-Prenant, a certain Blaise Poutrain; this Blaise Poutrain was the brother of Nicholas Poutrain, who was the last grave-digger of the cemetery called the Charnier des Innocents, in 1785, the epoch when that cemetery expired.