GENERAL OBSERVATIONS. 309 



light upon the progress of the bird westward, 

 for its arrival had already been noted at Glas- 

 nevin, co. Dublin, on the loth, and at Ballina, 

 CO. Mayo, on the 13th of the same month. On 

 the last-mentioned date its appearance in Scot- 

 land was chronicled in the county of Stirling, 

 but no information was given during that year 

 of its having been observed further north. 



In the case of the Common Whitethroat 

 something like a line of migration is indicated 

 by the dates at which the bird was observed. 

 Thus, arriving on the Devonshire, Sussex, and 

 Kentish shores on April ir, 13, and 14 respec- 

 tively, it was in Berkshire, at East and West 

 Woodhay, on the 15th and i6th ; in Leicester- 

 shire on the 1 8th, at Nottingham on the 21st, at 

 Great Cotes in Lincolnshire on the 22nd, at 

 Hovingham, near York, on the 23rd, and by 

 May 6 was as far north as Falkirk. The wind, 

 in all cases where it was noticed, was blowing 

 from the west or south-west, the temperature 

 gradually rising from 48° to 62°. 



Of the five-and-twenty observations made 



