286 Prof. Bischof on the Temperature of 



which he made about fifty years ago, in the salt-mines of Bex, 

 under very favourable circumstances. 



Many observations were also made in Germany, namely, in 

 Saxony. As, for example, those of Von Freiesleben and Von 

 Humboldt, in the year 1791 ;* those of D'Aubuisson, in 1802 -f- 

 of Von Trebra in 1805, 1806, 1807, and 1815,+ and lastly, 

 those of Von Herder, under the special management of Reich, 

 in the years ] 830-1 832.§ In 1 828-18^0, regular observations 

 have been carried on in various Prussian mining establish- 

 ments. || 



Great Britain has afforded us a great number of observa- 

 tions since 1815 ; namely those of Thos. Lean, Rede, Forbes, 

 and particularly W. Fox and Moyle in the copper and lead 

 mines of Cornwall and Devonshire, and those of Bald, Dunn, 

 and Fenwick, in the coal-mines in the north of England.^ 



In Sxoeden observations were conducted by the director of 

 mines, Claes Wallmann, in the mines of Fahlun.** From Italy 

 we have those of Fantonetti, in the gold mines of Pestarenadi- 

 Macugnana, -}- + in the valley of Anzusca. 



And lastly, we are indebted to Von Humboldt for observa- 

 tions in several of the mines of Mexico and Peru. X X Complete 

 compilations of these observations, with the exception of those 

 more recently made in Saxony and Prussia, are to be found in 

 various works. § § 



* Annal. de Chim., vol. xiii. p. 210. 



t Description des Mines de Frevberg, vol. iii. p. 151, 186, and 200, Journ. 

 des Mines, vol. xi. p. 517, vol. xiii. p. 113. 



X Geogr. Ephemeriden, 49, 432. Annal. des Mines, vol. i. p. 3/7, vol, iii. 

 p. 59, Annal. de Chim. vol. xiii. p. 211. 



§ lleich, loco cit. 



II Poggend. Annal. vol. xxii. p. 497- 



% Annal. de Chim. et de Phys. vol. xiii. p. 200, vol. xvi. p. 178, voL xix. 

 p. 438, vol. xxi. p. 308, and Geogr. Distribution of Plants, by Winch, p. 51. 



* • Kongl. Vetensk. ac Handl. ar 1831. 



ttSee Brugnatelli's Giornale, 1821, p. 467; also Gehler's neues Phys. 

 Worterbuch, vol. iii. p. 978. 



X X Annal. de Chim. et de Phys. vol. xiii. 207. 



§ § Annal. des Mines, vol. i. p. 378, and vol. iii. p. 63. Annal. de Chim. et 

 de Phys. vol. xiii. p. 183. Gilbert's Annal. vol. Ixxvi. p. 390, very complete. 

 Gehler's neues Phys. Worterbuch, voL iii. p. 974 and follotring. Reich, loco 

 citato, p. 139, very complete and comparative. 



