98 Dr. Latiam's Effay on the Trachea or Windpipes of Birds. 
but tinder the eye of the Anatomift, who examines them internally, 
how widely do they differ !—In the same one, little more occurs in 
refpe&t to the windpipe than’ is to be feen in the common Cock, 
whilft in the wld Swan it is lengthened greatly, and, entering a hol- 
low in the keel of the fternum, forms a doubling therein, before it 
returns to enter into the cavity and attach itfelf to the lungs, as 
will be hereafter fhewn. 
It feems unneceffary to fay more’ on this fibjen in a general way, 
as the circumftances will occur in courfe under their particular 
heads: to avoid repetitions, therefore, I fhall proceed to the defcrip- 
tions themfelves; and, firft, of thofe birds in which the ¢rachea or 
windpipe obtains a fingularity, from its vatious inflexions in its paf- 
fage to the Jungs, without greatly deviating from’ the uniform and 
éplitidticad fhape, beginning with 
I. TETRAO UROGALLUS—W oop Grows.” Tab, IX Fixtin ‘ 
b 
Ty. fufco-rufus, capite -colloque cinereis, oul, abdomineque nigtis, 
axillis albis. . 
Tetrao Urogallus, Linn. Sy/t. Nat. p. 273. ~IndvOrn, 2. p- 634.— 
Frifch. t. 107,108.—Raii Syn. Av. p.53..A.1.—Will. Orn. t. 30 
Auerhahn, Be/ch. der Berl. Nat. Fr. iv. p. 589. t. 18. f..2. - 
Coq de Bruyere, Buf. Oi. ii, p. 191, t5.—Pl, Enl. 73,74. 
Wood Grous, Cock of the Wood, Br. Zool. i. t. 40, 4l.—Gen, 
Syn. Ws Ps 729. 
In order to afcertain the {pecies here pesca it is right to obferve, 
that the Wood Grous is well reprefented in the Briti/h Zoology, and 
“ voix, mais cela ne fuffircit peut-étre pas pour prouver que leurs efpéces, foient differ- 
, “entes+ cette diverfite n’excedant pas la fomme des impreffions. tant interieurs qu’ex- 
‘“terieurs, que la domefticite & fes habitudes peuvent produire 4 la longue fur une race 
“affujettce.” Hift. des Oif. ix: p. 24. (f). 
Is 
