Dr. L A th A i*V Ejfay on the Trachea cr Windpipes of Birds. 125' 



rinth of the fuppofed male of the Mergus minutus of Linnaeus being 

 in all refpects fimilar to that of the Male Smew, added to the aflu- 

 rance of fome later writers, who have likewife ascertained the fact, 

 and penned their thoughts on the fubject. It therefore may be 

 concluded that we have no more than three diftinct fpecies of 

 Merganfer which migrate into this country. 



There are feveral other birds, befides the above, concerning 

 which I fear we {hall hereafter find ourfelves. miftaken ; but this is- 

 not the place for fuch inveftigation. The great increafe in number 

 of Gentlemen who make Natural Hiitory their ftudy, will no doubt 

 greatly contribute to detect many errors which have hitherto been 

 received as facts for want of due enquiry. 



EXPLANATION of the PLATES.. 



Tab. IX. 



Fig, I. The trachea or windpipe of the Wood Grous, or Ccck of the 

 Woody with its feveral appendages. — a. the tongue ; bb. the 

 the os hyoidesy or tongue bone, with its parts ; c. the larynx,. 

 with the orifice therein for the admiflion of air ; dd. muf- 

 cles which accompany the windpipe, one on each Cide; 

 e e e. the trachea. 



2, The Mar ail Turkey ^ ferving'to fhew the circumftance of the 



trachea rifing above the nefh on the bread before it goes 

 to the lungs. 



3. The Parraka Pbeafant, in which the fame fmgularity is ob- 



ferved in refpecl to the trachea^ but in a greater degree, 

 running down the breaft the greater part of its length. 



Tab. 



