Note 110 — ON THE STRUCTURE AND MODE OF ACTION OF VOLCANOS IN DIFFERENT PARTS OF THE EARTH.
Henry G. (Henry George) Bohn translation
p. 373—“Springs which rise from different depths.”
Compare Arago in the Annuaire du Bureau des Longitudes pour 1835, p. 234. The increase of the temperature is in our latitudes 1° Fahr. for nearly every 54 feet. In the Artesian boring at the New Salt-works (Oeynhausen’s Bath) near Minden, which is the greatest known depth that has been reached below the surface of the sea, the temperature of the water at 2231 feet, is fully 91° Fahrenheit, whilst the mean upper temperature of the air may be assumed at 49°·3 Fahr. It is very remarkable that, even in the third century, Saint Patricius, bishop of Pertusa, should have been led, from the thermal springs near Carthage, to form a very correct view of such an increase of heat.[RI]