THE INTERNAL CONDITION OF 

 THE EARTH; AS TO TEMPERA- 

 TURE, FLUIDITY, AND RIGIDITY. 



\BeingPaper read before the Geological Society of Glasgow, 

 February 14, 1878.] 



ON previous occasions I have referred to the 

 various arguments that have been adduced with 

 reference to the interior condition of the earth, and 

 to the different grounds on which it may be con- 

 cluded that, instead of being a liquid mass enclosed 

 by a mere thin shell of solid material, the earth 

 must be, on the whole, solid. 



That there is some liquid within the earth 

 is not to be denied. Immediately before lava 

 breaks forth in the eruption of a volcano there 

 is liquid in the interior ; and, from volcanic 



