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The intention of the present paper is to state the result of a series of observations on the connection of production of nitre with the state of the atmosphere; and the account begins with a description of the situation of the laboratory of the Ashmolean Museum, where these observations were principally made; the pavement being nine feet below the level of the street in which the museum stands, and seventeen below the highest part of its ceiling, which is arched, and, as well as the side walls, consists of a calcareous freestone. The saline efflorescence takes place principally on three sides that are surrounded by high ground, and but little on the fourth side, where the ground without is on a level with the pavement.

Observations respecting the natural production of saltpetre on the walls of subterraneous and other buildings