33 



sure, to determine to what quarter of the globe 

 they retire, when they leave Europe in autumn. 



Adanson, in his Voyage to Senegal, relates, 

 that on the sixth of October, being about fifty 

 leagues from the coast, between the island of 

 Goree and Senegal, four swallows alighted on 

 the shrowds of his ship, which he easily 

 caught, and knew to be European swallows. 

 He adds, that these birds never appear at 

 Senegal but in the winter season, and that 

 they do not build nests as in Europe, but 

 roost every night on the sand by the sea 

 shore. It is much to be lamented that Adan- 

 son, who was a naturalist, did not mention of 

 what species these birds were. It is, how- 

 ever, most probable, as they were seen at Se- 

 negal on the sixth of October, that they were 

 chimney swallows, Mr undines rusticae, as mar- 

 tins, hirundines vrbicae, seldom leave their sum- 

 mer haunts till after that time ; and swifts, 

 hirundines apodes, usually depart before the 

 twenty-fifth of August. With respect to bank 

 martins, hirundines ripariae, it is very unlikely 

 that Adanson should have mistaken them for 



