On Underground Temperatures. Table I. 



87 





V 



YI 



YII 





Depths 

 below 

 surface. 



Tempera- 

 ture at 

 deptlis. 



Eeeeeences and Eemabks. 



215 



Feet. 



1194 

 1456 



787 

 1361 



Fahr. 

 76° f 



81 t 



69* 

 81 



Letter from M. Cornet, April, 1883. Observa- 

 tions made 1200 metres from the shaft in 

 galleries ; perfectly dry and not ventilated. 



Ibid. In dry gallery 100 metres from shaft. 



Ibid. In a new shaft without water. 



216 

 211 



1548 



1680 



1709 

 620 



79 '5 

 79 "7 

 78-5 

 82 



81-5 



85 



61 



Ibid. At 2180 metres from shaft.^ 



„ 2400 „ „ | In galleries 

 „ 2600 „ „ ^> dry and not 

 „ 700 „ „ | ventilated. 



„ 900 J 

 fTher. placed in a spring of salt water issuing 

 |_ from a bed of sandstone. 

 " Brit. Assoc. Eeport," 1883. 



218 



2880 



84 



Ther. left 48 hours in hole. 



220 



252 

 390 

 876 

 1118 

 1884 

 2124 

 2244 



64 1 



65 



67 -8 



65(«) 

 70(a) 



83 



90 J 



- 



"Brit. Assoc. Eeport," 1883. 



(a) Observations considered defective. 



221 



1924 



82-5 



Letter from MM. Mauget and Lippmann, Jan. 1872. 



223 



213 



55 



" Eev. G-eoL," vol. i, p. 9. 



224 



255 



69-8 



" Quart. Journ. Greol. Soc," vol. xix, p. 69. 



226 

 221 



228 



1140 

 1250 

 700 



}» 1 







57 '5 





" Brit. Assoc. Eeport for 1882." 



229 



1370 



66 - 







230 

 231 



1176 

 1337 



70 1 

 75 '5 * 



Professor Judd in " Quart. Journ. Greol. Soc," 

 vol. xl, p. 724 (1884). 



§ Hole 4 feet deep, bored upwards in roof of coal. The stations in this pit 

 were under the sea. 



|| Hole 4 feet deep in shaly floor, under the " 10 yards " coal. 



% Situated in the valley near Dukinfleld. 



** Slight overflow, 4 or 5 gallons per minute. 



1st. Coal Mines. 



2nd. Mines other than coal. 



3rd. Artesian Wells and Bore-holes. 



