[ 21 ° ] 
arteria, but not fo confiderable as either of the fore- 
mentioned, fwan or crane : for it defcends in a flrait 
line, along with the oelophagus, to the middle of the 
jugal bone, without and above the thorax, where 
it is fpread and fattened on each fide. Then, turning 
backwards, being fomewhat flat, it makes a fold 
upward to about an inch and half high, and there 
being made faft again, by a ttrong membrane, it 
doubles down and pafles into the thorax, termi- 
nating by two bronchia in the lungs : and where it is 
fattened and folded, that is, in the flat parts, it is triple 
the circumference of any other part of the pipe. This 
bird and another of the fame fpecies were difledted by 
the Royal Academy of Sciences, and this ftrudture 
of the pipe appeared in both ; for which it is difficult 
to affign a reafon in any of the pheafant kinds, if it be 
not to retain infpired air longer than ordinary upon 
fome occafions, though they are not frequenters of 
rivers or marfhy grounds j which one might realonably 
fuggeft from the great capacity in the plicated parts of 
the wind-pipe. 
The next I fhall mention is the Grus Numidica, 
Numidian crane, or Demoifelie. 
This bird has alfo a plication in the wind-pipe, 
which was likewife diffedted by the Academy of 
Sciences, in whofe account the natural hiffory of it 
may be feen ; and a true defcription and figure of it 
from the life, by Mr. Edwards, in his Natural hiftory 
of birds. I confine myfelf only to the configuration 
of this part, in as many animals as I can find endowed 
with fuch a ffrudture, in order to colledt them and lay 
them here in view : and fhall hereafter make farther 
refearches and diflections, in fuch as I may reafonably 
6 fuppofe 
