96 



Prof. J. Prestwich. 



I 



Number in 

 the general 

 list, Table 1". 



II 



Name of colliery and place. 



III 



-Ls \J I J U LI W JL U1U 



or shaft. 



IY 



Distance of 

 station of 

 observation 

 from shaft. 









Feet. 



Yards. 







North America. 









59 





420 







60 





570 







61 





780 









„ (Another account (a)) 



600 











780 







Table III. — MINES 



Those observations which were made in Springs issuing from the 

 in Wells or sumps, W, and those in holes drilled in the Rock, R. 

 an affix is made of R or L. The distance of the point of observation, 

 at the spot is known in very few instances. The nature of the strata 



The Thermometric Gradient in Column IX refers to the entire 

 refer to the gradients for the intermediate depths (also in italics in 

 depths that is given (in brackets) in Column VII. 



I 



II 



Ill 



IY 





Number 











in 











general 



Name of mine and place. 



Nature of rock. 



Depth. 





list, 









Table I. 













England. 





Feet. 





2? 





Granite. 



1440 





13 



(1822).. 





1380 





15 



(1853).. 



55 



1632 





14 



(1857).. 





1632 





220 





Slate (Killas). 



252 





