106 Dr. Laruam’s Effay on the Trachea or Windpipes of Birds. 
- Cygne fauvage, Buf. Oif. ix. p. 3 
Der Singchwan, Beck/. Vog. Biaaieh: il. P. 58x. 
Wild or Whiltling Swan, Gen. Syn. vi. p. 433:-—Br. Zool. it, 
No. 264.—Edw. t. 150.—PAil. Tranf. \vi. pl. x. p. 215. f. 1. 2. 
The Wild Swan is a bird much lefs known than the same {pecies, 
which is every where domefticated, for it only vifits this king- 
dom in very fevere feafons ;—it differs from the laft, firftly, in the 
bill, which may be feen by comparifon 5 ; and fecondly, i in fize, being 
fmaller. The plumage likewife is by no means of that dazzling 
fnowy whitenefs which characterifes the tame fpecies; but the ef- 
fential and fpecific mark. of diftinétion is that of the ¢rachea, in 
which, as well as in the conformation of the breaft-bone itfelf, it is 
fo particularly different as to prove at once that there can be no 
relation whatever between the two, 
The windpipe in the /ild Swan, meant in this place to be treated 
of, paffes down the neck the whole of its length, after which it 
enters the keel of the fternum, pafling backwards therein nearly the 
whole of its length, when it bends upwards and forwards, and 
then enters the cavity of the breaft, to communicate with the 
lungs. It is not neceffary to mention further particulars, as the 
figure of the breaft-bone and frachea in fitu will fufficiently point 
out the circumftance ; nor is it neceffary to fay more in this place, 
than that the above ftructure of parts is obfervable i in both fexes 
indifcriminately. 
To obviate every poffibility of miftake between the two fpecies, I. 
have thought right to exhibit a front view of the breaft-bone of 
both, in which a large cavity may be feen in that of the wild 
{pecies, fufficient to admit of the entrance and exit of the srachea, as 
well as its doubling therein; whilft in that of the tame Swan 
(Tab. xii. fig. 3.) no other ftructure is obfervable than in the com- 
mon goofe, 
X; ARDEA 
