248 NATURAL HISTORY 



spots more productive of food ? Anatomists 

 say that rooks, by reason of two large nerves 

 which run down between the eyes into the 

 upper mandible, have a more delicate feel- 

 ing in their beaks than other round-billed 

 birds, and can grope for their meat when 

 out of sight. Perhaps, then, their associates 

 attend them on the motives of interest, as 

 greyhounds wait on the motions of their 

 finders ; and as lions are said to do on the 

 yelpings of jackals. Lapwings and starlings 

 sometimes associate. 



LETTER XIL 



TO THE SAME. 



DEAR SIR; March 9, 1772. 



As a gentleman and myself were walking 

 on the fourth of last November round the 

 sea-banks at Newhaven, near the mouth of 

 the Lewes river, in pursuit of natural know- 



