[ 4^4 ] 
“ bottom were draws, then coarfe and fine grades ; 
“ the whole ftru&ure of no great elegance. The few 
“ eggs, that were left behind, were of a clear un- 
<c ipotted white, the fize of a robbin-red-breaft’s.” 
This fair trial being made by a gentleman of ve- 
racity and ability is very conclufive ; for it certainly 
proves, that the fand martins do not take up their 
winter abode in their fummer dwellings. There- 
fore, there is fufficient reafon to believe, from the 
before-recited obfervations on the common /wallows , 
and this fo recently made on the J, and martins , that 
they are all birds of palfage. 
Additional Remark. 
There are four diftindt fpecies of birds, that go 
under the general name fwallow ; viz. the fwift or 
black martin ; 2. the fwallow, that builds in chimneys; 
3. the martin, that builds againft houfes; 4. the 
fand martin, that builds in fand-banks. 1 hope, that 
I have clearly proved, that fome of thefe fpecies are 
birds of pafiage. But fome of my friends aflert, that 
they pafs the winter in clifts or caverns of the earth, 
in banks or precipices. What is much to be regretted 
is, that the gentlemen were not curious enough to 
difiinguifii the particular fpecies, which they found in 
a torpid date. Monf. Adanfon, in his account of 
Senegal, has omitted this. So that nothing certain 
can yet be pronounced, which fpecies flays, or which 
goes. 
XLI. Obfer* 
