Note 393 — Chapter IV · (continued 2)

Girard and Duchatelet maintain that the subterranean waters of Paris are absolutely stagnant. See their report on drainage by artesian wells, Annales des Ponts et Chaussées, 1833, 2me sémestre, pp. 313, et seqq.

This opinion, if locally true, cannot be generally so, for it is inconsistent with the well-known fact that the very first eruption of water from a boring often brings up leaves and other objects which must have been carried into the underground reservoirs by currents.