&?t) Olservallom ok Sillterraneous Heat. 



fossils. He attempts to prove that neither volcanoes, earth- 

 quakes, rivers, nor currents, could possibly arrange the 

 surface of the earth as it is in the present day. 



These ideas have also been entertained by several celebrated 

 naturalists, especially when restricted to the last change ex- 

 perienced by the earth. Your committee {coitnnissaires) 

 even feel themselves able personally to adopt them in part, 

 although they well know that the reasons which determine 

 them cannot have the same influence on all the world. Yet, 

 for the reasons which they have before stated, they do not 

 wish to engage the Class to pronounce on such subjects. 

 But they do not hesitate to propose, that the Class should 

 testifv to M. Andre the esteem which it owes to his labo- 

 rious researches, and to the enlightened zeal which induces 

 him to continue his useful labours at so advanced an age. 

 They do not doubt that the work of this respectable philo- 

 sopher will be received by naturalists as a collection so rich 

 in interesting facts ought to be. 



LVIT. Observations upon Suh terraneous Heat, made in the 

 Mines of Poullcouen, and of Huelgoat, In Britamj, in 

 France. Bv J. F. Daubui.sson*. 



J. here are few questions in physics, respecting which it 

 is more necessary to be in possession of positive and well 

 established facts, than the temperature of the interior of the 

 globe, taken at depths which it is in our power to visit. I 

 have already published some facts on this subject with re- 

 spect to the mines of Saxony, and now proceed to detail 

 some others resulting from observations made last summer 

 (1806) in the mines of Poullaouen, and of Huelgoat, in 

 Britany. The habits to which I have been accustomed of 

 examining these subjects, added to my knowledge' of the 

 countrv, having enabled me to choose, with some discern- 

 ment, the points where I wished to ascertain the tempera- 

 ture, I hope that the facts I am about to relate will not be 

 unintercstmg to those who are occupied with the physics of 



* From the 'Journal dc? Mines, vol *x.i. p. l\9. 



the 



