PROFESSOR HUXLEY'S LECTURES. 



49 



mony to an eternity of duration, you must have an eternity of wit- 

 nesses or an infinity of circumstances, and neither of these is attain- 

 able. It is utterly impossible that such evidence should be carried 

 beyond a certain point of time, and all that could be said at most 

 should be that there was nothing to contradict the hypothesis. But 

 when you look, not to the testimonial evidence which might not be 

 good for much in this case but to the circumstantial evidence, then 

 you find that this hypothesis is absolutely incompatible with that cir- 

 cumstantial evidence, and the evidence is of so plain and so simple a 

 character that it is impossible in any way to escape from the conclu- 

 sions which it forces upon us. 



IDEAL SECTION OP THE CRUST OF THE EARTH. 



-Post-tertiary and Recent. 



Pliocene. 



Miocene. 



Eocene. 

 Cretaceous. 



Jurassic or Oolitic. 



Triassic (New Red Sandstone). 

 Permian. 

 .... Carboniferous. 



Devonian or Old Red Sandstone. 



Silurian. 



Cambrian. 



Huronian. 



Laurentian. 



B J m 1 -> -.a W ft. - t . 



^^^mmm 



IgSoIrI c .'?* T *' : " <i *& 



.'g.'p.iiO Fo-ZoZo Ze.'o. 



VOL. X. 



