130 The Natural History of Selborne 



make the shafts of their long feathers clatter like the swords of a 

 sword-dancer ; they then trample very quick with their feet, and run 

 backwards towards the females. 



I should tell you that I have got an uncommon calculus <gogropila, 

 taken out of the stomach of a fat ox ; it is perfectly rouncj, and 

 about the size of a large Seville orange : such are, I think, usually 

 flat. 



