On Underground Temperatures. Table I. 



65 



Depths 

 below 

 surface. 



Feet. 

 402 

 642 

 786 

 822 

 372 



390 

 432 

 486 

 768 



1500 

 1722 



648 

 804 

 924 

 654 



1420 

 1706 

 300 

 756 

 816 

 936 

 1056 

 282 



450 

 690 

 810 

 108 

 642 

 462 

 810 

 162 

 1242 

 1422 



1482 

 180 



432 

 762 

 1050 

 1440 

 1122 

 1214 



VI 



Tempera- 

 ture at 

 depths. 



■5 J 



VII 



References and Remarks. 



Small stream from lode. 



Large „ „ ■„ 

 Large stream from cross-course. 

 Large stream from lode. 

 Large stream from rock. 

 Small stream from lode. 

 Large „ „ „ 

 Small „ „ „ 

 Small stream from rock. 

 Large stream from lode-end. 

 Large stream from rock. 

 Small stream from vein. 

 Hole in rock. 



Moderate stream from lode. 

 Small stream from rock. 

 Small stream from lode. 

 Large stream from lode. 



Temperature of rock. 



Henwood, " Trans. Roy. GTeol. Soc. Cornwall," 

 vol. v, p. 389 and 402 (1843). The observations 

 in all these mines were taken in springs issuing 

 from the lode or rock. 



Ibid., p. 387. 



Ibid., p. 402. Average of various mines in ten 

 districts. 



Matteucci, "Comptes rendus," 1843, p. 937; 1845, 

 p. 816. 



VOL. XLI. 



