70 



Prof. J. Prestwich. 



Locality. 



94. Reggie-, Italy 



95. Grhadames, Tripoli 



96. St. Petersburg .,, 



91. Messis, Algeria 



>> ?j 



98. Meiahadalon, Algeria. . . 



>> j> ■• • • 



j> >> » • • • 



99. Chega, 



100. Bothwell, Ontario, U.S. . 



101. Eochefort, Charente Inf. 



102. Virac (Tarn) 



103. Montigny, Belgium 



104. || Pendleton Colliery, 



Manchester. 



105. Hucknall Torkard Col- 



liery, Nottinghamshire 



106. Annesley Colliery „ 

 1©9. Xiveton Park Colliery ,, 



108. Swan wick Colliery „ 



109. Moira Colliery, Warwick- 



shire. 



HO. Euabon, North Wales . . 



II 



Place of observation. 



Artesian well 



Coal pit 



III 



Height of 

 surface 

 above 

 sea-level. 



Feet. 



15 



705 



126 



460 



420 



IV 



Mean 

 annual 

 tempera- 

 ture of 

 surface. 



Fahr. 



65-5°* 



73-4 

 m38-6 

 68? 



54-5 

 55? 

 51 

 m48-6 



s 48 '9ft 



48 



* Temperature of Messina. 



t The rate of increase is given at 1° C. in 30 to 31 metres. No other particulars. 

 X Water rose above surface, at rate of 700 gallons per hour, from the Corniferous 

 Limestone. 



§ Temperature of air in gallery 68° F. 



|| Nos. 104 to 122 inclusive are from the Eoyal Coal Commission, 1866-70, vol. ii, 

 " Eeport on the Possible Depth of Working." 



This was in the floor ; temperature in coal 70° at a distance of 500 yards from 

 the down-brow. In the same level 1000 yards from the down brow, the temperature 

 was 83° in the coal, and 82° in the floor. 



