3T6 M. L. Elie de Beaumount on the Structure and 



the sea ; the cause of both must probably lie in the locality. 

 The conclusion drawn by Reich, from the above observations, 

 viz. that, in the Erzgebirge, the temperature of the soil is 

 throughout 1°.8 higher than the mean temperature of the air, 

 seems, however, to be somewhat too hazardous. 



All these facts prove that great differences may exist between 

 the mean temperatures of the air and of the soil ; but that they 

 only originate in local causes, and do not stand in any relation 

 with the geographical latitude of the place. 



( To be continued. ) 



Analysis of a Memoir on the Structure and on the Origin of 

 Mount Etna. By M. L. Elie de Beaumount, Member 

 of the Royal Academy of Sciences of the Institute.* Com- 

 municated by the Author. 



I he first chapter of the memoir, after having referred to 

 the i.amerous investigations of which Etna has been the object, 

 I have indicated the precise point of view under which I under- 

 took to examine the subject. My purpose was chiefly to ascertain 

 and to explain, more precisely than had been previously done, 

 the orographical " accidens" which have modified the regularity 

 of the pyramid of Etna. 



I must necessarily commence by giving an account of the ge- 

 neral features of the form of the mountain. In order to illus- 

 trate this part of the subject, I have the honour of presenting 

 to the Academy a map, four views, and a relief model of Etna, 

 which I have constructed in part from my own observations. 

 If I had succeeded completely in the execution of these different 

 objects, they would have presented to the eye a complete ana- 

 lysis of this part of my essay ; but even in that case I could not 

 have dispensed with defining some expressions, and particularly 

 some of the leading features. It will be found, doubtless, that 

 the map, the views, and, above all, the relief model, correspond 



• Read at the French Academy cf Sciences Nov. 30. 1835. 



We have great pleasure in presenting to our readers this important me- 

 moir, communicated to us in manuscript bj its distinguished author.—. 

 Edit. 



