On Underground Temperatures. Table L 67 





V 



VI 





VII 





Depths 

 below 

 surface. 



Tempera- 

 ture at 

 depths. 





References and Remarks.. 



56 



Feet. 

 1263 



Fahr. 



IOI° 





Daubree, " Comptes rendus," 1845. 



51 

 58 



1476 

 2200 

 2297 



Xivi ' 



93 '2 

 ?§ J 





Rivot, "Ann. des Mines," vol. viii, p. 79 (1845). 

 " L'Institut," April, 1845. 



59 



420 



°3 







60 



386 

 570 



330 









61 



65-5 

 6i * 7 



• 



Professor H. D. Rogers, 1846. Observations in 

 Report on Coal Mines of Eastern Yirginia. 



62 

 63 

 64 



600 

 230 

 967 

 616 



66-2 

 68'7 j 

 57-2 • 



71 '6 



60 -8 





D' Archiac, " Histoire des Progres de la Greologie," 



vol. i, p. 77 (1847). 

 Dewalque, " Bull. Greol. Soc. de France," vol. xx, 



p. 235 (1849). 

 "Bull. Geol. Soc. de France." 



65 

 66 



61 

 68 

 69 



1647 

 2362 



50 

 100 

 400 

 1000 

 1106 

 164 



1817 



2677 



(*) 78 -3 " 

 (6)81-7 



68 " 



68 



72 



84 



88 



59 



8: " 



IOO 



f 



Walferdin, " Comptes rendus," 1853, p. 250. 



(a) Temp, of first overflowing spring. 



(b) ,, of the mud in bore-hole ; this is un- 

 reliable on account of convection currents. 



Hume, "Edin. New. Phil. Journ.," vol. lvii, p. 178 

 (1854). Nothing said about protection against 

 pressure or convection currents. Observations 

 were taken at every 100 feet. 



Scarabelli, " Bull. Soc. Greol. France," vol. xiv, 

 p. 102 (1856). 



Walferdin, "Comptes rendus," 1857, p. 971. 



lo 



11 



12 



768 

 1248 

 1128 



;: 1 



0) 79 j 



\ 



R. Were Fox, " Brit. Assoc. Reports for 1857," 

 p. 96.ft 



(a) Under the sea — gallery quite dry. 



% Water rose 2 metres above surface. 



** Eighteen protected thermometers used. The boring at Torcy had been sus- 

 pended for six months. The observations at Mouillonge were made only after one 

 to three days' rest. The two borings are 1500 metres apart. 



ft Most of these experiments were made at or near the ends of the deepest levels 

 of the mines. Casella's thermometers were used in the later experiments. They 

 were placed in holes 15 to 20 inches deep in the rock, which were carefully closed 

 with clay, tow, or cotton. Thermometer left in for | to 1 hour. 



F 2 



