ANNOTATIONS AND ADDITIONS. 399 



mean temperature of the air above may be taken at 7. 7 Reaumur, 

 or 49. 2 Fahr. It is very remarkable that in the third century 

 Saint Patricius, Bishop of Pertusa, was led, by seeing the hot springs 

 near Carthage, to a very just view respecting the cause of such an 

 increase of heat. (Acta S. Patricii, p. 555, ed. Ruinart; Cosmos, 

 bd. i. s. 231 English edition, vol. i. p. 211.) 



