STOCK 449 



This moor is divided in its lower half by a deep and wide 

 valley, which thirty years ago the birds rarely attempted to 

 cross. That they now require no provocation to make the 

 passage is evidence of their higher physical condition. There 

 is no possible doubt that their power of flight has much in- 

 creased in the last twenty years. 



The system of driving over one set of butts is suitable, 

 of course, to a very limited number of moors, and even when 

 possible might not be adopted for reasons unnecessary to 

 mention here. The system is mentioned solely as a possible 

 explanation of the remarkable change that came over this moor 

 at a time which coincided with its adoption. 



2 F 



