MAM TOR, NEAR CASTLETON. 3 1 



compact sandstone above, with its vertical joint-faces, being deprived of sup- 

 port Uy the crumbling of the shale, breaks off in large masses, which join the 

 dibris at the foot of the precipice. " 



Mr. Gould i.s anxious that the plan.s accompanying his 

 articles on " Earthworks " should, for convenience of com- 

 parison, be drawn to the same scale, and as a standard 

 he adopts that of the 25 in. Ordnance map. It is 

 to be hoped that this system will become popular in 

 archaeological literature, for nothing is more misleading than 

 variations in scale. Mam Tor is the largest of our Derbyshire 

 earthworks, and its plan would, otherwise, have been reduced, 

 to avoid the somewhat crowded effect of the plate. — Ed. 



