Sir John Lubbock's Address. 285 
crust; the other, of a practically solid sphere. The former is 
now very generally admitted, both by astronomers and geol- 
ogists, to be untenable. The prevailing feeling of geologists on 
this subject has been well expressed by Professor LeConte, 
who says, “the whole theory of igneous agencies—which is little 
less than the whole foundation of — geology—must be 
reconstructed on the basis of a solid earth. 
The ancient poets described certain gifted mortals as privi- 
