of Strata on the Banks of the Whitadder, 277 



north banks of the Whitadder, it is probable that this neigh- 

 bourhood will very frequently witness a repetition of the phe- 

 nomena similar to the one which has so recently occurred. I 

 remain, ray dear sir, yours very faithfull}', 



D. Milne. 

 Milne-Gradek, Coldstream, \ 

 29th July 1828. ) 



Examination of the Experiments hitherto published on Subter- 

 ranean Temperature, together with Experiments and Inqui- 

 ries relative to this Examination. By M. L. Cordiee, 

 Member of the Royal Academy of Sciences, and Professor 

 of Geology in the Garden of Plants*. 



X HE experiments that have been hitherto pubhshed on sub- 

 terranean temperature are of two kinds. 



Some of them have for their object to examine the tempera- 

 ture of common springs, of rivers which issue directly from the 

 earth in certain countries, of artificial fountains, of waters issuing 

 from caves or galleries of drainage, intended for the drying of 

 great mining works. These experiments are not numerous, nor, 

 as we shall afterwards shew, do they furnish any other than ap- 

 proximative data. 



The object of the other experiments has been to determine the 

 temperature of natural or artificial cavities, by means of which 

 we are enabled to penetrate into the bowels of the earth. These 

 experiments are numerous, and lead to results Which have been 

 regarded as precise. They have been pushed as far as from 1300 

 to 1600 feet. The following is a brief account of them : 



In France, we have the experiments made in the caves of the 

 Observatory of Paris, which were commenced about 150 years 

 ago, and which have been perfected by M. Arago ; those made 

 by Gensanne -f, in the metallic mines of Giromagny, about the 

 middle of the last century ; and those in 1806 by M. Daubuis- 



• Read to the Academy of Sciences, 1st June 1827- 



t Dissertation sur la Glace, par Mairan j Paris, 1749, in 12mo. p. 60. 



