226 ON CAUSES PREVENTING SMOOTHNESS OF GROUND. 



wide. I see no reason for supposing that those I acciden- 

 tally met with in the incipient state surrounded by cracks 

 were the normal size for all Iceland or other places. 



AAA/ 



Forms on the gravel : flat 

 (from memory). 



Forms on the grass : raised 

 (from memory). 



And now let us consider the state of a peat-bog in refer- 

 ence to irregularity of surface. Viewed from a height a 

 peat-bog has frequently an appearance somewhat resem- 

 bling the field described; not quite so, however. The 

 raised parts are not regular in shape, although there is a 

 rough similarity among them. They are also different 

 in size, and not of the same regular dimensions as those 

 mentioned. The furrows are wet, and are sometimes 

 streams of water — always, one may say, to some extent 

 draining. Have they had a similar origin, being some- 

 what similar ? Or being somewhat similar, have they had 

 a somewhat similar origin? 



I see no reason for believing that the original form of 



