C 282 I 



coafl of Africa, to which fhort flight, however, they 

 were unequal, and were obliged from fatigue to fall 

 into the failors hands. 



Monf. Adanfon likewife mentions * that the {hip's 

 company caught a Roller on the 26 th of April, which 

 he fuppofes was on its pafTage to Europe, though he. 

 was then within fight of the coaft of Senegal : this 

 bird, however, mull be admitted not to have had 

 fufficient .itrength to reach the fir ft fbge of this 

 round-about journey, and was therefore probably 

 forced out to fea by a ftrong wind,, in palling from 

 head-land to head-land, 



But I mull not difmifs what hath been obferved 

 with regard to the fwallows ken by Monf. Adanfon 

 at Senegal, without endeavouring alfo to anfwer 

 what M. de Buffon hath not only inferred from it, 

 but hath endeavoured to confirm by an aclual ex-* 

 periment -f. 



M. de BufFon, from the many in (lances of fwallows 

 being found torpid even under water, very readily 

 admits, that all the birds of this genus do not mi- 

 grate, but only that fpecies which was feen by Monf. 

 Adanfon in Africa, and which he "generally refers to 

 as the chimney fwallow J j but from the outfet, feems 



* Voyage au Senegal, p. 15. 



■f See the two prefatory difcourfes to his fixteenth volume 

 of natural hiftory. 



% So little do naturalifts know of this very common bird, 

 that I believe it hath never yet been obferved by any writer, that 

 the male fwallow hath only the long {lender feathers in the tail, 

 which are confidered as its moft diftinguifhing marks. I venture 

 to make this remark upon having feen the difference in two 

 fwallows which are in Mr. Tunftall's collection, F. R. S. as alio 

 in two others, which have lately been prefented to the Mufeum 

 2 tO 



