TYPES OF ANCIENT BRITISH EARTHAVORKS. 75 



told, is of the saine kind as that found in some of the 

 most ancient fortresses in North Wales. 



May not these, then, be British towns of earlier date 

 than the Belgic invasion ? and may not the Dumnonii have 

 constructed this line of defence against the Belgre on the 

 same plan as these more ancient fortifications ? And may 

 not this be in reality the aboriginal type of fortification ? 

 while the coneentric plan iä that in use among the invading 

 Belgas ? 



This is, indeed, but a crude theory ; but it has often 

 happened that great discoveries have been the result of 

 guesses, having less apparent foundation than that which I 

 have now ventured to suggest. 



