xxxu 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



CoHiery of the Poirier, Montigny. 



Temperature. 



Cent. 



Fahr. 



Pits St. Andre and St. Louis, Dec. 10, 1867. Surface- 

 temper&ture . .... 



0° 

 14 



22 -50 

 24-50 

 20 -00 



32° 



57-2 



72-5 



76 



68 



At depth of 672 metres, or 2202-76 feet 



In a stone- diift, 240 yards from St. Andre pit 



In a rise-incline in the seam . . . . 











Colliery of Thevson. 



Temperature. 



Cent. 



Fahr. 





3°-50 

 14 00 

 22-00 



38°-30 

 57 -2 

 71-6 



At depth of 704 metres, or 2309 feet 







Colliery of Sacree-Madame, at Pampreny. 



Temperature. 



Cent. 



Fahr. 



Fit Fond du Pige. — Temperature at surface, Dec. 

 1867 



3°-50 



8-50 



9-50 



17-00 



7-00 

 10-50 

 22 -00 



38°-3 

 47-3 

 49-1 

 62-6 



44-6 

 50-9 

 71-6 



At depth of 562 metres, or 1843 feet 



At depth of 602 metres, or 1974 feet ' . 



At bottom of up-cast shaft 



JSngine- shaft. 



At depth of 424 metres, or 1390 feet 



At depth of 634 metres, or 2079 



At bottom of up-cast shaft 





Pit Simon Lambert, at Gilly. 



Temperature. 



Cent. 



Fahr. 



At depth of 1064 metres, or 3489 feet Enghsh 



26°-00 



78°-8 





This latter observation is interesting, as taken at the deepest 

 point to which man has yet penetrated in the crust of the earth ; 

 but its correctness is doubted by II. Gemaert ; and even if accepted, 

 it can only be held, along with the others above recorded, to verify 

 the general conclusion of the rapid rate at which an in-going cur- 

 rent of cold air is heated by contact with the rock suifaces. The 

 result is satisfactory in a technical point of view, as showing the 

 moderate temperature which, by means of active ventilation, may 

 be made to pervade the deep workings ; but, for scientific deduc- 

 tions, we must await the series of observations which M. Gemaert 

 proposes to carry out through different seasons of the year. 



