C 282 ] 
coaft 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 fliip’s 
company caught a Roller on the 26th of April, which 
he fuppofes was on its pafiage to Europe, though he 
was then within fight of the coaft of Senegal : this 
bird, however, muft be admitted not to have had 
fufficient llrength to reach the firft flage of this 
round-about journey, and was therefore probably 
forced out to fea by a flrong wind, in palling from 
head-land to head-land. 
But I muft not difmifs what hath been obferved 
with* regard to the fwallows feen by Monf. Adanfon 
at Senegal, without endeavouring alfo to anfwer 
what M. de Buflbn hath not only inferred from it, 
but hath endeavoured to confirm by an aftual ex- 
periment ■f'. 
M. de Buffon, from the many inftances 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 but from the outfet, feems 
* Voyage au Senegal, p. 15. 
f See the two prefatory difcourfes to his fixteenth volume 
of natural hiftory. 
J 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 flender 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 Air. Tunftall’s colledtion, h . R. S. as alfo 
in two others, which have lately been prefented to the Mufeum 
Z i0 
