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fwan is ftrait within the bone, and may be compared 
to a trumpet } yet the entrance of this into the fter- 
num, and its exit, and its paflage into the cavity of the 
thorax, are fimilar to thofeof the fwan. 
This is a bird who cannot go upon the water, 
being no more capable of fwimming than a common 
cock or hen. His feathers will not admit of it; 
and, having no webs to his toes, it is unable to fwim. 
It is fomewhat furprifing that not one of the tribes 
which are fimilar to the crane, fuch as the herons, 
ftorks, bitterns, See. has any fuch ftrudture of the 
afpera arteria ; and yet they all feed upon fifli or water 
infeds. We are, however, to confider, that the heron 
chiefly haunts brooks, fprings, and the narrow heads 
of rivers, where he feeks his food, and finds it with 
eafe : but the crane is under a neceffity of immerfing 
its head, and remains a confiderable fpace in that 
lituation upon ftrands and marfhes : it is alfo a bird of 
congrefs; for, at certain feafons, a multitude of cranes 
flock together and rife upon the wing to a great height 
in the air, being birds of paflage, and they are by many 
authors faid to travel from mod parts of Scythia to 
Egypt, where, for a certain feafon, they remain about 
the Nile, and the great lakes of that country. Perhaps 
this elongation of the windpipe in them may be alfo of 
ufe, in their great flight through various degrees of 
rarified or condenfed air, in the variety of climates 
through which they pafs. 
The Indian cock, Gallus Indicus of Aldrovand and 
Longalius,and Gallus Perficus of Johnfton, the Mutu 
Poranga of Margrave, is notthe Coq d’Inde, or Turkey 
cock, but by the laft author ranged among the 
pheafant tribe ; this bird has a plication of the afpera 
Vol. LVI. E e arteria, 
