OI» THE MIORATION OF SWALLOWS. gj^ 



XII. 



On the Migration of Stmllows : by Dr. Traill. Read be-^ 

 fore a Literary and Philosophical Society established at 

 Derby, Sept. the Mth, IS08, of which Dr. Traill is a 

 Corresponding Member, 



To Mr. NICHOLSON. 

 SIR, 



X OUR correspondent Mr. Ferster having solicited in- Migration of 

 formation on the subject of the migration of swallows, Dr,^s^^'a''ows. 

 Traill was induced to request, that the following paper, 

 after having been read to the Derby Society, might be' 

 transmitted to you for publication. In compliance with 

 that wish it is herewith enclosed ; and, I have no doubt, will 

 be considered as an interesting contribution to this curious 

 branch of natural History. 



I am. Sir, 

 Your very obedient Servant, 

 Derby, CHARLES SYLVESTER. 



Extract from the Logbook of the Ship Jane of Lancaster. --•^ 

 Captain John Thomson. 



On the 17th of May, I8O7, in latitude 51° 42' north; 

 longititude 21° 44' west. Pleasant clear weather. Wind 

 W. N. W. 



18th. Pleasan-t clear weather. Light airs and calms. 

 Wind varying from S. E. to E. N. E. Lat. D. R. 52° 6' N. ; 

 long. 21° 44' W. 



19th. Steady breeze from E. S. E. Some showers of 

 rain, and foggy weather for the most part of this day. Lat. 

 IK R. 5-2" 11 N.; long. 21°, 16' W. 



20tb. Strong breezes, varying from S. to S. E. Foggy ^ . . 

 weather. About 4 p. m. several martiyts and swallows ap- swaiiovt- I'ghu 

 ptared about the two ships. At 8 p. in. collected to a large 'hf ,Tii/th -At- 

 covey ; many of which pitched on different parts of this ship, lamic in May. 

 and allowed themselves to be taken up by the seamen. At 

 dayligbt io the morning found many of them dead in the 



